In general: no, this is not possible.

That would like like "porting" a Windows executable (written in QT) to a Linux executable just by renaming the file

You'd need to get the source of the program and see if it can recompiled targetting the N9. Even though QT itself is "portable", the program will not necessarily be portable, as it may rely on features/APIs that Symbian has and the N9 doesn't.

Which program is that?