Flight Simulator 2000 no-cd fixed .exe and win2k PROBLEM!

[Huinase]

My Prob:
I installed MS Flight Simulator 2k under win98, got the fixed exe and played on without cd and without probs...
then I upgraded to win2k, installed MS FS2k again, played, then I used the SAME fixed exe to play without a cd, and I get the message box " this is not a valid win32 application" every time I try to start the Game.
Same happes with several other no-cd cracks, that bring along a fixed exe (i.e. NOLF), win98 compatibility mode does not solve the prob- anyone out there with the same prob and/or solution to it??
thx in advance!