I am in the process of developing a game but the problem is that it is .exe and not .swf. Instead of trying to find a converter or port it I wish to recreate the game in another engine. Is the task in general difficult to do or does it entirely matter on the languages?
unity, UDK, or Torque should be able to port to different systems.
Depending on the language you used to write the code, recreating for a different platform shouldn't be too hard. If the language is C++ I believe you should have no problems.