Thanks Yurbuh Tuggly - for this and all the other posts in this thread ! And, also, thanks Fatboyfun - for the same reason.
Yeah, unbelivable as it may sound, I wasn't aware of the difference between Windows CE and Windows Mobile. I have several WM devices (PDAs), but this is my first WinCE. I'm almost thinking of reselling or giving it away ! It's REALLY useless if I cannot make even my own app work on it - I thought I'd enjoy the larger screen, that's why I bought it ! That, and the price.
PS. I found three .rar files with iGO Primo optimized for Europe (no Maps) :-), but they seem to be password protected, and I didn't notice any password. Any ideas ?