Compatibility Administrator has a search function. You should try it.

If you're talking ACT then I searched that and only my fix appears, if I install the fix.

If you mean the simpler compatibility administrator, where you can apply compatibility modes (I.E. Troubleshooter) then even if I select to remove anything applied it makes no difference!

You said truckrace.exe runs with no compatibility modes, are you sure you're looking in the right place? It should automatically set DWM8and16BitMitigation on Win8 systems and I'm pretty sure you're running Win8.

I can't reproduce, but I'm thinking it's possible you're somehow running mbtr_setup.exe and truckrace.exe with different compatibility flags, I'm not sure since I disabled a lot of the virtualization things, but if for example the config app was run as admin and the game is not... Maybe the game just thinks sound is disabled.

If you want to test that you can use process monitor to check where the config app writes its reg entries and if the game reads them from the same place.

I'm not massively bothered, as I renamed the game's version of TruckRace.exe to TruckRaceB.exe and now it works with sound and the NoGDIHWAcceleration fix to get >30fps on my Win8.1

MBTR_Setup.exe also has a "Windows shield" graphic on it, implying something's been changed (brings up UAC prompt when run, like any game with a compatibility mode on it).

Process Monitor I will be looking at soon, as I try to get F1 2000, F1 Championship Season 2000 and F1 2001 to work (curiously the very similar F1 2002 works fine, as does Sports Car GT, the engine that went on to drive F1 2000, although SCGT uses nGlide).

another thing to consider, a problem I just ran into: some games set their volume to 0% with Win Vista+ per application volume control. So check the Windows sound mixer. And yes, that's saved per filename.

What video hardware are you using? I had the impression that drivers from NVidia and ATI had their own internal compatibility databases, though I don't know how you would get to them.

If you're asking me, is in my signature 😉

Oh, right. So apparently the per-application settings are in "Manage 3D Settings".
http://www.howtogeek.com/175281/how-to-force- … intel-graphics/

It seems to work on the basis of EXE names, and there is indeed an entry for truckrace.exe.

Ah yes, that area... I'll check it out!

It does indeed have the game, but the settings are all "Use global setting", so there shouldn't be anything too funky going on.

If it's in that list it's also possible it has some hidden Nvidia compatibility flags. You can use Nvidia Inspector to look at that and also eventually delete the profile. I already tried this though, it made no difference.