Quote from Chris82 on 03/07/09 at 10:16:20:Is it possible to edit .RWN files? If so, what program would I use?
Sure, use XVI32
http://www.chmaas.handshake.de/delphi/freeware/xvi32/xvi32.htm You asked an open ended question and my answer is perfectly valid. However, I doubt it's what you had in mind. GasGiant answered the question you meant to ask, I answered the question you actually asked.
BTW, in my opinion TAS sucks but you can download it for free at:
http://www.addsuminc.com/ or
http://cassoftware.com/tas/index.html Those are the two versions. I don't remember which ISTech uses.
Then all you are lacking is the current EvoERP source code. This isn't available so you'd have to have Guido make them an "offer they can't refuse."