Well, it's certainly possible to port programs originally written for OS/2 if they were written in, say, C or C++. You might, of course, need to re-write some libraries here and there (I don't know whether OS/2 had the same type of DLL system as Windows does, but that might be an issue), or work around needing them, but there's no reason a port should be impossible.
On the other hand, stuff written in, say, Pascal, or where source is unavailable would be, whilst technically possible in a yes-but-the-moon-will-go-blue-and-get-invaded-by-Martians-first way, the chances of anyone making such a converter are astronomical. At best.