It seems that FSX Steam is relying on a FSXSE\10.0 path to launch.
As I've said, you DO have BOTH FSX and FSX:SE installed. But in that case, the correct registry should be different: the FSX registry keys pointing to FSX and the FSX:SE registry keys pointing to FSX:SE
Under NO circumstances, BOTH registry keys should point to the same folder!
I'll repeat it AGAIN:
The correct situation
with ONLY FSX:SE installed is to have the FSX:SE\10.0 key
REMOVED:
- HKEY_CURRENT_USER\Software\Microsoft\Microsoft Games\Flight Simulator - Steam Edition\
10.0 ONLY the "10.0" should be removed!
And the FSX registry key:
- HKEY_CURRENT_USER\Software\Microsoft\Microsoft Games\Flight Simulator\10.0
Pointing to the FSX:SE installation folder. This is a CORRECT registry
for an FSX:SE installed with no FSXIf, instead, you have
BOTH FSX and FSX:SE installed, the CORRECT registry should be:
the FSX registry key:
- HKEY_CURRENT_USER\Software\Microsoft\Microsoft Games\Flight Simulator\10.0
pointing to the FSX folder
and the FSX:SE registry key:
- HKEY_CURRENT_USER\Software\Microsoft\Microsoft Games\Flight Simulator - Steam Edition\10.0
pointing to the FSX:SE folder