Hey fellow simmers! I've had this issue before but for the life of me can't remember how I fixed it. My FS9 runs fine, doesn't crash hardly ever. But any time I try to connect any peripheral software, like AI Separation, or weather programs, those programs say that FS9 is not running. I have done the registry repair, I have deleted all references to fs9 from the registry and did a clean install. I have tried various combinations of compatibility modes, but all to no avail. Any insights on what I may be missing? thanks

5 hours ago, collotty said:

... Any insights on what I may be missing? thanks

You may not have installed the FSUIPC module, but external programs require it to be installed.

What version of Windows are you using?

I've found the older "Registry Repair" fix to not work with W10 Pro 64-bit.

I figured a work-around for my installation, but I don't know if it's relevant to any other version.

Try running the peripheral software as administrator.

On 7/7/2026 at 4:51 AM, chris_eve said:

What version of Windows are you using?

I've found the older "Registry Repair" fix to not work with W10 Pro 64-bit.

I figured a work-around for my installation, but I don't know if it's relevant to any other version.

Windows 11. What was the workaround you found?

On 7/7/2026 at 2:25 PM, Steve0616 said:

Try running the peripheral software as administrator.

I have tried that along with almost every combination of compatibility there is

On 7/6/2026 at 8:09 PM, Sergiusz Bielicki said:

You may not have installed the FSUIPC module, but external programs require it to be installed.

BINGO! Thanks. Except I did install FSUIPC, but when I checked the FSUIPC.dll was missing for some reason. The other fsuipc files were there however. Problem solved! Thanks flightsim community!

On 7/10/2026 at 11:14 AM, collotty said:

Windows 11. What was the workaround you found?

I created a registry entry as follows -

Windows Registry Editor Version 5.00

[HKEY_LOCAL_MACHINE\SOFTWARE\WOW6432Node\Microsoft\Microsoft Games\Flight Simulator\9.0]

"EXE Path"="C:\\Flight Simulator\\FS9"

Copy the above three lines to a suitably-named text file with a ".reg" suffix, then execute it, though you'll probably need to edit it first to suit your installation.

Do bear in mind this has only been tested successfully on W10 Pro and W11 Pro, both 64-bit installations. 32-bit and/or "Home" versions may differ.

Edited July 12Jul 12 by chris_eve
problems with editing

On 7/12/2026 at 10:30 AM, chris_eve said:

I created a registry entry as follows -

Windows Registry Editor Version 5.00

[HKEY_LOCAL_MACHINE\SOFTWARE\WOW6432Node\Microsoft\Microsoft Games\Flight Simulator\9.0]

"EXE Path"="C:\\Flight Simulator\\FS9"

Copy the above three lines to a suitably-named text file with a ".reg" suffix, then execute it, though you'll probably need to edit it first to suit your installation.

Do bear in mind this has only been tested successfully on W10 Pro and W11 Pro, both 64-bit installations. 32-bit and/or "Home" versions may differ.

ok, thanks for that info! filed away for future reference