OpusFSI Flight Simulator Interface for and

OpusFSI_v6_Overview  OpusFSI_v6_User_Guide  OpusFSI_v6_Getting_Started_Single_PC  OpusFSI_v6_Getting_Started_Networked_PCs  OpusFSI_v6_Live_Weather  OpusFSI_v6_Live_Camera  OpusFSI_v6_ButtKicker

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Getting Started - Single PC (continued)

General Operation

If you are using TrackIR then run TrackIR and the sim before running OpusFSI.

If you are not using TrackIR then the SERVER program should be run after Prepar3D, or you may configure your system to run the server program automatically each time you start Prepar3D.

When the SERVER program is activated it will resume its previous minimized or visible state, and will be displayed in its last known location on the screen. The SERVER program will automatically abort when the sim is shutdown.


Starting the OpusFSI Software Automatically with P3D

The SERVER program can be started automatically each time P3D is run, simply by editing the content of the standard P3D exe.xml file. 

The P3D exe.xml file can be found within the c:\Users\username\AppData\Roaming\Lockheed Martin\ Prepar3D\ directory where 'username' identifies your login account name.

If the file doesn't exist then you can create it using Notepad, just remember the xml file extension when saving the file.

Edit the xml file using Notepad. Paste the contents of the OpusFSI _ExeXml_Server.txt file at the end of the xml content. You should paste the content in just before the closing </SimBase.Document>  statement.

For example, after editing the content of the xml file, the content should look something like this for P3D,


<?xml version='1.0' encoding='Windows-1252'?>

<SimBase.Document Type='Launch' version='1,0'>






  <Name>OpusFSI_v6 Flight Simulator Interface Server</Name>





Of course you may already have several Addons listed in the xml file. In which case you will find each Addon specified within a separate <Launch.Addon> .. </Launch.Addon> block.

You will need to edit the c:\OpusFSI_v6\P3DSERVER.EXE entry and specify the correct drive location if you have installed it anywhere other than the standard C drive.  

The SERVER program will accept a delay command line argument in the form DELAYn where n is the required start delay in milliseconds (e.g. P3DSERVER.EXE DELAY2000 will delay the program start by 2 seconds). This argument can be used to delay an auto start within the simulator's EXE.XML file using the <CommandLine>DELAYn</CommandLine> entry, for example,



  <Name>OpusFSI_v6 Flight Simulator Interface Server</Name>





will delay the P3DSERVER programs start by 2 seconds (2000 mS). The program arguments can be specified in any order. The program arguments are,


DELAYn ... Delays the program start by 'n' milliseconds.

NONE ... Auto selects No Connection To Simulator type (CLIENT only).

When you next run the sim if you are prompted to trust OpusFSI then confirm Yes.  

Turn off  User Account Control (UAC)

User Account Control (UAC) can prevent OpusFSI from running automatically with P3D on Windows 7/8 systems. If this happens turn off UAC as follows,

1.      Open User Accounts by clicking the Start button, clicking Control Panel, clicking User Accounts and Family Safety (or clicking User Accounts, if you are connected to a network domain), and then clicking User Accounts.

2.      Click Change User Account Control settings (or Turn User Account Control on or off ). If you are prompted for an administrator password or confirmation, type the password or provide confirmation.

3.      Move the slider bar to Never notify (or clear the Use User Account Control (UAC) to help protect your computer check box) to turn off UAC, and then click OK.  


Operating System Recommendations

Select the High Performance Power Scheme to ensure optimum performance whilst using the simulator. 

PC Performance

We recommend turning off all virus scanners whilst running P3D since they can have a serious effect on performance.

Disable Windows Defender.   

We recommend turning off all virus scanners whilst running the sim since they can have a serious effect on performance.  

Disable Windows Defender.

Don’t have any internet browser windows open, they decrease performance.

Deleting Window’s CompatTelRunner.exe will also increase performance,

Microsoft try and prevent this overly demanding 'spy' program from being deleted. However, removing it is quite straight forward once you've done it a few times.


Step 1 - Locate the program


Open Windows Explorer, navigate to the C:\Windows\System32 folder, and locate the CompatTelRunner.exe program.


Step 2 - Take ownership


Right click on the program, select Properties then the Security tab. Click on the Advanced option. You will see the program's Owner is set to TrustedInstaller, click on the Change option next to it.


In the 'Enter the object name..' text box type Everyone and click OK. Click OK again to close the Advanced Security dialog.


Now in the CompatTelRunner Properties dialog (Security tab still), click on the Edit button followed by the Add option. Type Everyone in the text box again and click OK.


Finally back in the Properties box, highlight Everyone in the Group list and then tick the Full Control checkbox in the Allow options.


Click Apply and Yes to the prompt.


Click OK twice to close all the dialogs.


Step 3 - Delete it


You should now be able to right click on the CompatTelRunner.exe program and select the Delete option. If not, restart the PC and delete the file. With the program deleted Microsoft can no longer spy on you and gather compatibility telemetry data and more important your PC won’t work at a snails pace while it does.


Just be aware Microsoft will occasionally reinstall its CompatTelRunner program during certain updates.


Prepar3D Recommendations

Ideally your simulator should be installed on a dedicated SSD or HDD, at the very least try and install your simulator on a different drive to your Addons, this will ensure the simulator runs more smoothly. Avoid installing the simulator in Program Files since this causes permission problems.  

You cannot start OpusFSI until P3D has loaded its flight, or a prepared Default flight (remember you can always relocate after the start up). Do NOT run OpusFSI when P3D has its 'Create Flight' dialog on display. This is due to a bug in P3D. We recommend you create a Default flight with nil wind; load the Default flight; update the weather using OpusFSI; use the ATIS over the radio to confirm the active runway after injecting the weather, this ensures the correct runway is allocated.

You can of course start P3D in the setup screen, just make sure you load your flight BEFORE running OpusFSI.

In P3D simulator mode the Enable Volumetric Fog option is set automatically using the VolumetricFog setting within the Prepar3D.CFG file. If you change this setting during a P3D session then either change the Enable Volumetric Fog Effect in OpusFSI to match P3D or restart OpusFSI.   

Don’t have an internet  browser window open (or even minimised) when running the sim since it usually has a detrimental effect on the sim’s performance.

OpusPDK Interface Setup Guide for P3D

The OpusPDK Dynamic Link Library (OpusPDK_v45.DLL) provides a fast and efficient direct link into Lockheed Martin's Prepar3D simulator via the Prepar3D PDK interface.

This interface imposes minimal demand on the Prepar3D simulator and provides for fast and efficient camera control for all OpusFSI view transitions, panning sequences, and general eye point positioning. This interface is highly recommended and used for all Live Camera, Live Camera Control, and DHM eye point movements.

The OpusFSI PDK interface is enabled by launching the OpusPDK_v45.DLL library within the Prepar3D simulator itself. The PDKSETUP program will add the required OpusPDK launch statements to the simulator's DLL.XML file. If the DLL.XML file does not exist on your system the PDKSETUP program will create one automatically.

FYI the Prepar3D DLL.XML file is located in the standard AppData folder e.g. C:\Users\<user_name>\AppData\Roaming\Lockheed Martin\Prepar3D v5

Where <user_name> is your Windows user name. To make these folders visible in Windows Explorer you may need to edit your folder options. Open Folder Options via the Windows Explorer View - Options - View tabs. Then tick the Show hidden files, folders and drives option. I would also recommend you disable the Hide Extensions for known file types option.

Setting up the OpusPDK Interface

The OpusPDK Interface is prepared by running the supplied PDKSETUP.EXE program in Run as Administrator mode. This setup program will create or modify the simulator's DLL.XML file, including all necessary launch statements ready for when you next run the simulator.

1. Open Windows Explorer.
2. Navigate to your OpusFSI_v6 installation folder.
3. Right click on the PDKSETUP.EXE entry and select 'Run as Administrator'.

Checking to see if the OpusPDK Interface is Active

After running the simulator and starting OpusFSI you can check the state of the OpusPDK Interface simply by opening the OpusFSI Spy window. If the OpusPDK Interface is already active and connected you will see a statement similar to the following reported in a yellow colour within the Spy window,

    SIM Connected to OpusPDK Interface (6.00.0)

If the Spy window is opened before the sim connection then the following statements will be displayed in a red colour,

    SIM Link established with OpusPDK (6.00.0)
    SIM OpusPDK Library Version Validated

If at any time OpusFSI detects an incorrect (out of date) OpusPDK library version it will display a Windows Prompt warning you something is wrong. In which case you may need to reinstall OpusFSI making sure the simulator is shutdown first.

Under normal circumstances, the software monitors the health of the OpusPDK Interface all the way through to the P3D simulator response, checking the link every 4 seconds. All changes in PDK status will be reported via the OpusFSI Spy window as either 'OpusPDK Not Responding At The Moment' or 'OpusPDK Now Responding OK'.

The PDKSETUP.EXE utility program will accept optional TEST and REMOVE program arguments. The program arguments can be appended in any order and are not case sensitive. The TEST argument will prevent the simulator's DLL.XML file being created or modified in any way. The REMOVE argument will remove rather than add the OpusPDK launch statements.

Typical DLL.XML file content with just FSUIPC5 and OpusFSI Add-ons

<?xml version="1.0" encoding="Windows-1252"?>
<SimBase.Document Type="Launch" version="1,0">
<Name>FSUIPC 5</Name>
<Path>E:\Prepar3D v5\Modules\FSUIPC5.dll</Path>

Recommended Settings and Practice for Dynamic Live Weather

* This will enable the cloud and visibility smoothing, wind stabilisation and dynamic wind control options in the Weather Smoothing dialog.

** If you specify a Max Cruise Altitude of 4000 feet or more the LWE will download and process the GRIB forecast data from NOAA.

*** If you have specified Background GRIB Processing in the Weather Downloads dialog then the GRIB data extraction and lengthy decoding will proceed at a slower pace and can take several minutes. Otherwise the processing will be done as fast as possible at the expense of the sim performance or frame rates. The GRIB data is only downloaded once before flight and the decoded data will be valid all day or at least for nine hours so this is normally not a concern or problem. However, most users need GRIB data for flight planning and preparation.

**** Before flight you should get into the habit of checking the weather. At the very least display and check the Opus Local, Lower, Upper, and Destination Weather reports. You may also like to examine the various Opus text reports accessed via the sim Add-on menu. There are separate reports showing the downloaded METARs, all the GRIB wind and temperature targets from 4000 feet up to FL540, all the en route weather for any specified flight plan including TAFs if you have enabled them, and finally an easy reference to all relevant SIDs and STARs. This report gives a handy direction and bearing for each listed SID and STAR.

The Opus weather reports (e.g. the Destination Weather) should be checked during climb and descent to monitor all wind and temperature targets, compared with the actual sim ambient conditions. This way you will know that your sim is operating as expected.

Never disable weather updates, the sim will NOT cope on its own it simply cannot contain all the necessary data.

Text Weather Reports, located in the OpusFSI_v6\Weather folder and accessed via the sim Add-on menu ...  

OpusWeather.txt ... The downloaded METARs

OpusWeatherReport.txt ... The GRIB data report

OpusFlightReport.txt ... The flight plan en route weather report

OpusSIDSTARReport.txt ... The relevant SIDs and STARs

Live Weather Assistant (LWA) and Weather Map data ...

Surface Visibility

Precipitation Levels

Surface QNH

Surface Temperatures

Cruise Level Temperatures

Upper Level Temperatures

Surface Winds

Cruise Level Winds

Upper Level Winds

Cruise Level Turbulence

Upper Level Turbulence

Lower Level Cloud Cover

Medium Level Cloud Cover

Met Station Cover

The LWA and up to six weather maps can be displayed on the server or a networked client.  


SimObject Path Additions

The OpusFSI_SimObjects_Template.txt file can be used to define a list of SimObject paths not currently identified by OpusFSI, normally addon aircraft that have been installed elsewhere and not defined anywhere that OpusFSI checks.

Copy and rename the supplied OpusFSI_SimObjects_Template.txt file to OpusFSI_SimObjects_P3D.txt. OpusFSI will check and process the file for the additional path specifications.

Prepar3D systems should already include a 'simobjects.cfg' file within their common application data (c:\ProgramData) folder. These files are also checked and decoded by OpusFSI so try not to duplicate additional Simobject paths in the above text file if used. Your specified SimObjects folders should each contain the same Airplanes or Rotorcraft sub-folders as the standard SimObjects folder within the sim. The SERVER and CLIENT programs will accept SimObject Addon paths that end in specific sub-folder names '\Airplanes' or '\Rotorcraft' (with or without a trailing backslash). Previously the standard '\SimObjects' root folder was assumed and the sub-folder names '\Airplanes' or '\Rotorcraft' were appended prior to looking for the additional (addon) SimObjects.

Don't forget to check that any addon folders are shared with adequate sharing and security permissions.

Each path must be entered on a separate line in the form,
    Path = <full_path_specification>

For example,
    Path = E:\3rd Party\Company_XYZ\SimObjects

The SERVER and CLIENT create a log file named SimObjects_P3D.log. This log file lists all SimObject Airplane and Rotorcraft paths that are checked along with any errors encountered during the process. The log file helps determine the reason why any aircraft/rotorcraft are not detected by the SERVER program.


Ensuring AI Traffic uses the Correct Runway

Create a Default flight with 0 wind. Load the Default flight. Update the weather using OpusFSI.

Use the ATIS over the radio to confirm the active runway after injecting the weather, this ensures the correct runway is allocated.

Using this simple procedure will always ensure your AI traffic start out using the correct runway.


FSUIPC Settings

FSUIPC is required on the SERVER system. FSUIPC is required on Live View CLIENTs that are connected to the simulator and used to display camera views.

You can download a free copy from http://www.fsuipc.com

We recommend you do not run OpusFSI automatically via FSUIPC since some users have reported problems running it this way.

Turn everything off in FSUIPC, we recommend disabling all settings. We do not use FSUIPC for any weather or turbulence related effects.

If you choose not to install/activate FSUIPC then at the moment OpusFSI will not be able to pause the sim, it is normally paused when opening certain Opus dialogs. Hence you will have to pause and unpause the sim manually.

To disable FSUIPC simply remove the associated <Launch.Addon>...</Launch.Addon> entries within the simulator's dll.xml file.


  <Name>FSUIPC 5</Name>





TrackIR Settings

The 64-bit FSITRACKIR.EXE control program relies exclusively on the new high speed 64-bit OpusPDK Interface. Hence, the OpusPDK Interface must be activated to use this new TrackIR program. If the OpusPDK Interface is not active then the 32-bit SimConnect FSITRACKIR control program will be activated instead.

Before using the interface you MUST 'Check For Game Updates' within your TrackIR5 and ensure OpusFSX (or OpusFSI) is listed in Titles under the Advanced Settings tab, then restart TrackIR.

Prior to using the TrackIR5 device via OpusFSI you must ensure TrackIR5 does not directly connect to the P3D simulator. To accomplish this you MUST rename the two SimConnect manifest files within the TrackIR5 installation folder. The folder is usually located in,

c:\Program Files (x86)\NaturalPoint\TrackIR5 (Win 7 64-bit)

BEFORE using the Opus TrackIR interface the files you MUST rename are simconnect.manifest and simconnectSP2.manifest

We recommend renaming these files to simconnect_RENAMED.manifest and simconnectSP2_RENAMED.manifest

If you wish to revert back to using TrackIR without the OpusFSI interface then you will have to change these files back to their original names.

Check your TIR manifest files after any TIR update, the TIR software can create new files after the upgrade.

Do not copy SimConnect.dll to your root directory otherwise TrackIR will find it and connect directly to P3D instead of OpusFSI.

Run TrackIR and P3D before running OpusFSI. Minimise the TrackIR program to prevent FPS loss.

Do not run any other program that controls the camera views, creates camera shake effects or interfaces to TrackIR. Make sure no such program or subordinate task is running, do not allow any other program to connect to TrackIR prior to OpusFSI.

TrackIR Tuning

TrackIR effects must be tuned using the TrackIR program. TrackIR can be used with the default TrackClip, or it can be used with TrackClipPro. TrackClipPro has its own LED emitters and its setup is very different from TrackClip, refer to the TrackClip and TrackClipPro sections below.

Make sure you have Video Processing Mode set to Precision or Standard with a Precision Mode Smoothing of 100. It has been brought to our attention that on some systems TrackIR can become very jerky if 'precision' is disabled, its default key assignment is F7 so it's possible to inadvertently change its setting if you use F7 to increase flaps. 


We would advise initially setting the Speed to 1 and the Smoothness to 50. You should experiment on your system and set values your PC is happy with to avoid any jerky DHM movements. Use the test options within the DHM dialog to see what the DHM should look like on your system, then try taxiing up and down in windowed mode and adjust your TrackIR smoothness to give you the optimum effect.

Make sure your Light Filter Threshold isn't set too high, try setting 70, and adjusting from there, with a max setting of 12 for your IR Brightness. Light pollution and an incorrect Light Filter Threshold setting are the number one main causes of flicker.


It has been reported that for TrackClipPro the Camera IR brightness should be zero and Light Filter Threshold should be set to a high value. The easiest way to get the correct settings is to click the TrackClipPro button in the TrackIR window and it will reset the Camera settings automatically.


TrackIR Flickering or Erratic Movement

Problems arise when the light threshold is wrong. If it is too low, extraneous lightsources in the room will falsely trigger TIR into seeing that other lightsource as one of the TrackClipPro's beams. This causes all kinds of false head-rotation issues, which show up as flickering.
The easiest way to solve the problem is to go into the TrackIR main view, right-click on the head-graph window, and choose Camera View, and then tweak the Light Threshold to a point where there is NO red 'false lightsources' visible anywhere during the full range of head movement. This can even change during the course of a day (depending on the intensity of reflected light from windows, eye glasses, items in the room etc.).

Your IR brightness levels should be zero. Try selecting the old Trackclip momentarily and then re-select TrackClipPro, and this should clear the IR settings back to zero (off). The TrackClipPro does NOT require the camera to send out IR signals (which are normally reflected off the front of the old Trackclip for the camera to pick up). Instead, the TrackClipPro generates its own light beams directly (that's why it's connected by wire and powered) - but of course, the camera can still get confused if there are large alternate light sources in the room competing with it.

Here is a handy little tip for fixing TrackIR jerkiness, http://airdailyx.blogspot.co.uk/2012/09/spf100-track-ir-adx-tutorial.html

Make sure you don't have any monitoring programs (e.g. FSUIPC autosave) running since they can cause TrackIR to become jerky.

Try enabling the Run TrackIR High Priority option in the Server Configuration dialog if TrackIR is not operating smoothly. You may need to try different versions of the TrackIR drivers to get it working smoothly on your system.  

TrackIR will not Connect to OpusFSI

If you update the TrackIR software remember to rename the two SimConnect manifest files within the TrackIR5 installation folder. 

Search your system and make sure there are no more manifest files located anywhere. Check your root directory and in fact search the entire PC for them. If TIR finds any manifest file it will not attempt to connect to Opus or anything else apart from the sim direct.

Try running everything manually and don't use any automated method. Run TrackIR manually after P3D, then finally run the SERVER, in other words do not run TrackIR and the SERVER automatically via P3D or FSUIPC. 

OpusFSI TrackIR Settings

Within OpusFSI set the TrackIR scan speed to 25 initially, the XYZ scaling to 1 and PBY scaling to 0.75. These can be adjusted on the fly from within the Configuration dialog. 

The TrackIR scan speed can be altered from 6ms to 60ms. If TrackIR is jerky then adjust this setting (try 25-30) in conjunction with your TIR device Speed and Smoothness settings to reach an optimum effect. If you set the scan rate too high it stutters, if you set it too low it jumps. 

The PBY setting should be adjusted in conjunction with the TIR device speed settings to determine the range of head movement and how far you can see behind you.

You may need to try different versions of the TrackIR drivers to get it working smoothly on your system.  

If you are still having problems with jerkiness after setting the TIR light levels then you can try enabling Run TrackIR High Priority  in the Server Configuration dialog.

TrackIR Operation

TrackIR can be enabled or disabled for each camera view within Live Camera, this is useful for instance when you want to adjust the GPS via a small click spot, if TrackIR (and DHM) movement is frozen you can operate the click spot no matter how unsteady your head is.

The TrackIR interface can be toggled on/off within the Cameras dialog (Toggle TrackIR On/Off button), allowing camera configuration and editing with the TrackIR device either on or off.  

TrackIR Cockpit Limits

To set up TrackIR cockpit limits refer to the OpusFSI_Live_Camera.pdf document.

TrackIR Updates

Check your TIR manifest files after any TIR update, the TIR software can create new files after the upgrade which you will need to rename again (see above for details).  


Using FS2Crew with OpusFSI

There can be an issue using FS2Crew since it relies on the 2D Panel initially being loaded. You can work around this by creating a 2D default camera view for your aircraft and follow the procedure below. Note this example procedure uses the NGX aircraft.

1. Start OpusFSI, enter Destination, Cruise level and any Alternates.
2. Start P3D.
3. Wait for NGX to initialize in 2D mode (20 second countdown).
4. Switch to 3D VC
5. Start FS2Crew.
6. Commence Preflight.

Uninstalling OpusFSI

If you wish to uninstall OpusFSI prior to an upgrade then uninstall via Control Panel, Uninstall a Program. Do not delete your OpusFSI_v6 folder (containing your configuration files) or Opus Software folder (containing your licence files).  

Can't uninstall OpusFSI

If you are having problems uninstalling Opus due to a misssing msi or registry corruption then use the following Microsoft utility, https://support.microsoft.com/en-gb/help/17588/fix-problems-that-block-programs-from-being-installed-or-removed

Alternatively if you wish to remove OpusFSI completely from your system and have used Live Camera then first restore your aircraft.cfg files by disabling Live Camera in the Configuration dialog. A message box informs you that Live Camera is removing the Camera Definitions from all aircraft.cfg files for you. These changes will NOT be noticeable until you either restart P3D, or reload a completely different aircraft type forcing P3D to reload the modified cfg file. Uninstall OpusFSI via Control Panel, Uninstall a Program. 


FAQ and Troubleshooting

Can I use other software packages with OpusFSI?

We strongly recommend the use of 3rd party packages such as FEX for their sky and cloud textures, or HDEv2 (freeware) for clouds with the sky upgraded by Danny Glover. You will really see the benefit of using the OpusFSI Live Weather Engine with these textures loaded. We do not include or load any sky and cloud textures, we just create and load the most detailed and realistic weather. However, if you rely on the default sky and cloud textures within P3D then no matter how detailed the weather is it will not look very impressive. Disable the weather update in 3rd party packages to prevent conflict with the OpusFSI weather engine.

If your aircraft doesn't include sounds then we would also recommend the use of packages such as Accu-Feel for the sound effects but with the Accu-Feel global turbulence, chop, gusts, and clear air turbulence aircraft movement options disabled since they conflict with OpusFSI.

TrackIR can be used with OpusFSI but Automatic Head Movement will be automatically disabled.  

ButtKicker and ButtKicker compatible devices can be used with Opus.

How to Purchase

Follow the link from our home web page or display our downloads page and click on the OpusFSI v6 link in the Purchase or Reinstall column. Alternatively use this link, OpusFSI_v6_Flight1_Purchase.exe 

Download the OpusFSI_v6_Flight1_Purchase.exe onto your main 'flying' server (sim) system to purchase the product. 

When you run the purchase file a Flight1 form with 3 buttons will be displayed. If you already have a Flight1 account click button 1 to log in (this is optional and if you get any Flight1 login error messages don't use it). Click on buttons 2 and 3 to fill in your purchase details and then the Purchase button will appear, click on this button to complete purchase.

After purchase, the Opus msi installation file will be unwrapped into c:\Opus Software along with your license key and you will receive an email confirmation of your order. Run the msi to install Opus and follow the instructions in our Getting Started guide.

I can't start my Flight1 downloaded application (it never runs), so I can't purchase the software

You need to make sure Data Execution Protection (DEP) allows the EXE to run. You can check your DEP settings by selecting Control Panel, System and Security, System, System Protection, Advanced tab, Performance Settings, Data Execution Prevention tab. Select "Turn on DEP for essential Windows programs and services only" option, or try to add the EXE you downloaded to the exception list.

Also, ensure that you have full Administrator access to the computer and you may need to disable any virus scanner or spyware program that is running.

If you still have problems refer to the Flight1 website troubleshooting.  

If all else fails then download it on another computer, make sure it runs, and then move it to your flight sim computer using the Flight1 licence transfer tool.

My payment was not accepted by PayPal

Contact Flight1 for further assistance.

My virus scanner gives me a warning for the Flight1 downloaded application

Unfortunately, one of the most common issues when people can't get software to run is interference from a Virus or Spyware scanner. Although they do good things, in many cases they can interrupt programs you may want to run. If you get an error message that does not appear to be from the downloaded EXE, you need to make sure your virus or spyware scanner is disabled prior to running the EXE. If you are concerned about this, you can scan the file prior to running it, and then after your purchase, if you are prompted to automatically run the setup application, select No, then manually scan the setup application. This is usually extracted right after your purchase is made.
False-Positive reports with software is common.

'The cabinet file is corrupt' error message

If you see the error message,

The cabinet file '_xxx' required for this installation is corrupt and cannot be used. This could indicate a network error, an error reading from the CD-ROM, or a problem with this package

then it is most probably a corrupted msi file so just download it again. If you are using Chrome then try another browser.

I can't download Opus (signature is invalid or corrupt)

If you get a warning the signature is invalid then right click on the msi and select Run Anyway.

If you see the following screen then click on the More info button to run the software. Next select Run Anyway.

Using Windows Explorer navigate to the location of the downloaded file and run the software. If you have a problem running the software then right click on the file and click “Unblock" or follow one of the other methods in Can't run the msi in Windows.

Internet Explorer seems to be the most reliable browser for downloads. Try downloading on a different computer if possible. If you are downloading the purchase file on another computer, make sure it runs, and then move it to your flight sim computer using the Flight1 licence transfer tool.

If you are having problems downloading then make sure your anti-virus software is disabled, anti-virus software may also delete our software after it has been downloaded or installed unless you make the Opus exe programs  trusted applications.

'There is a problem with the windows installer package. A DLL required for this install to complete could not be run... ' error message

The installer doesn't have permissions to access the folder C:\Users\<name>\AppData\Local\Temp. 

Go to Properties > Security on the folder and give Everyone the Full control permission.

Can't run the msi in Windows

1. Turn UAC OFF.

2. Run the Command Prompt in Admin Mode (not the same as you being an Admin user).

3. Type: bcdedit /set testsigning off

4. Reboot. Windows will power up in a test mode and will allow you to run any msi file.

5. Install the msi file. After installing the software ...

6. Run the Command Prompt in Admin Mode (not the same as you being an Admin user).

7. Type: bcdedit /set testsigning on

8. Reboot

 After rebooting you should still be able to run msi files but may need to answer 'More Info' and 'Yes' to a Windows 10 user query.

System.TypeInitialisationException error

You need .NET version 4.7.2 for P3Dv4 onwards and SimConnect to be installed for OpusFSI and its SimConnect links to work.

You can check what versions of .NET you have installed in Control Panel by selecting Settings, System, Apps and features, then search for .NET and a list of installed versions will be displayed. For older operating systems you can check what versions of .NET you have installed by checking your c:\Windows\Microsoft.NET\Framework or Framework64 folders. You should see a v4.0.xxxxx folder.

In the case of SimConnect, first make sure you have installed P3D, SimConnect is installed automatically with it. If you have mislaid or corrupted your SimConnect then you can try re-installing it. 

SlimDX error

You must ensure the P3DSERVER program ...

Is starting in the correct c:\OpusFSI_v6 folder.

Has permissions to copy and rename the SlimDX DLL file.

Is able to copy the current SlimDX DLL, it's not locked or write protected.

Is not blocked by AV or Win Defender software.


Otherwise its attempt to copy and rename the SlimDX file will fail. You may also need to install the SlimDX dotNet runtime using our supplied msi file in the OpusFSI_v6 folder.

Opus won't run or aborts

If Opus won't run or immediately aborts then make sure it is installed in the OpusFSI_v6 folder in the root directory and not a sub-folder of the drive. Otherwise reboot your PC, this problem may be due to a windows update which needs a reboot of your PC. 

OpusFSI won't run in Windows 10 
If you have set up the security and sharing permissions as described in the above section, have run as Administrator, and the software still won't run on Windows10 then run both the Microsoft vcredist_x86.exe and vcredist_x64.exe VC redistribution packages located in the OpusFSI_v6 folder. For new Windows10 builds you may need to download and install the older 2013 C++ Redistribution packs (vcredist_x64.exe and vcredist_x86.exe) from the ‘Other Downloads’ section of our Downloads webpage http://www.opussoftware.co.uk/opusfsi/downloads.htm.

When I install and run the SERVER it runs in demonstration mode

You must install the Flight1 purchase file on your C drive. You can move the msi to another location but must leave the OpusFSI_v6 and/or OpusFSI licence and key files on drive C in the C:\Opus Software folder.

Opus can only be installed on one drive in one folder. Uninstall any old versions of Opus using Control Panel, Uninstall a Program. Do not delete your OpusFSI_v6 folder though since your configuration (DAT and CMD) and camera (CAM, LIM and CDF) files are stored there, assuming you want to keep them.  

Check your OpusFSI_v6\FSISERVER.log for errors. 

If your Name and Order Number are blank in the Spy window then your licence file cannot be accessed due to either file permission problems or a corrupt licence file.

If you try and edit the licence file it will become corrupt, you should not open the licence file. If this has happened download and reinstall the Purchase OpusFSI_v6 file. Refer to Reinstalling Opus on a new or reformatted PC.

Your system will require a valid OpusFSI licence, internet access and the computer clock must have the correct time.  

Simulator's Installation Folder, Unable to access the installation folder...

Opus tries to copy the OpusWeather.WT weather file into the Prepar3D\Weather\themes folder and will display this error message if it cannot do this.

If you see the above error message then it is essential that you check your installation folder is specified correctly in the Configuration dialog. Try reconfiguring the sim location again.

Also check your sharing and permissions, it is important to set permissions as well as sharing as described in the OpusFSI_v6 Getting Started guide.

Spy Error Messages

P3D Failed to establish link 1 with P3D
Error HRESULT E_FAIL has been returned from a call to a COM component.

This usually does not indicate a serious error, it usually means P3D is not running and hence, the software cannot connect to SimConnect. If you are running P3D it could mean you do not have SimConnect installed, or SimConnect is not functioning correctly.

You must have P3D installed on the main 'flying' server and each client computer system. You should also install the same scenery and aircraft addon packages. The aircraft addon packages need only be installed however if you want to use external 'aircraft' views on the client system. If this happens to be one particular client PC or laptop then install the aircraft addon just on that machine.

Note, you do not need to run P3D if you just wish to test the network connections or set up the SERVER and CLIENT programs.

Failed to establish link with FSUIPC

Error code 8

Error code 8 means you have the wrong Flight Simulator system for FSUIPC.

Opus stops working

Make sure you only have one copy of Opus installed in Windows Control Panel using the Uninstall Programs option (not some Cleaner type package). 
All the FS... EXE and DLL files in the OpusFSI_v6 folder should have the same date, if they don't then uninstall Opus and reinstall.
The software looks for the licence and key files on drive C in your c:\Opus Software folder. 
Don't install Opus in the Opus Software, sim, or Program Files folders, and don't install in more than one folder on your PC.

P3D freezes or my aircraft will not move

The problem is caused by running both the Opus SERVER and CLIENT programs on the same PC. If you have a standalone system you must only run the SERVER program, do not run the client program that will freeze your sim (it is only intended to be run on networked client machines).

Don’t run OpusFSI automatically via FSUIPC.

Before disabling 3rd party camera packages their configuration utility must be run and the "Restore" function selected to restore all camera views to P3D default, otherwise 3rd party camera definitions are not removed from the aircraft config files and can cause problems.

The master battery and parking brake indications aren't correct

You need to install FSUIPC on the OpusFSI client PCs. You can download a free copy from http://www.fsuipc.com. FSUIPC is used for the following functions;
setting the sim clock, master battery and parking brake, and pausing the sim.  

Overspeed and Underspeed Warnings

If you are flying with the sim rate speeded up, especially above x6 then it is possible to get overspeeds or underspeeds. Even at x6 speed, your auto pilot or P3D may oscillate the air speed repeatedly causing repeated overspeeds. You should disable the P3D stress causes damage option.

Reinstalling OpusFSI on a new or reformatted PC

Download and run the Purchase OpusFSI_v6 file.


Reinstall using your Flight1 account, you will need your email and account password. You can request your account password from Flight1 if you have forgotten it. If you don't have a Flight1 account then you can create one.

If you still can't reinstall then
request a new key file from Flight1.

You may install the software onto any drive provided its folder name is OpusFSI_v6 with the exception that you must not install OpusFSI in the Opus Software, Prepar3D or Program Files folders, and don't install in more than one folder on your PC.

You may install the software onto any drive provided its folder name is OpusFSI_v6 with the exception that you must not install OpusFSI_v6 in the Opus Software, Prepar3D or Program Files folders, and don't install in more than one folder on your PC.

Prepar3D v5 Settings Error - Please correct errors or click Cancel

There is a bug in Prepar3D v5 that rears its head when trying to change its Options after OpusFSI weather has been injected. This is because the Prepar3D weather checks think it’s an error if the cloud tops of one layer are above the cloud base of another. In such cases P3D gives the prompt,

Please correct errors or click Cancel

There is however a simple solution until LM get round to correcting this,

1. Select Weather options.

2. Select the Clouds Layers.

3. Delete any overlapping cloud layers.

4. Select OpusWeather again in the Weather Conditions section.

5. Click OK.

In Step 3 you may also simply reduce the overlapping cloud Tops. Again don't forget to reselect OpusWeather before clicking OK.

Step 4 (selecting OpusWeather again) is MOST IMPORTANT in order to preserve the injected weather.


Additional FAQs regarding weather, camera and network issues can be found in the relevant Weather, Camera and Getting Started Networking user guides.

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