To ckeck for operation system one could use cond[pn]=['getOSver()=="XP"') .. the include on XP or cond[pn]=['getOSver()!="NT"') .. the exclude only on NT getOSver returns the following strings: XP, 2K, NT, ME, 98, 95 or "Not found" actually I don't know when it was changed but xp reads as wxp and windows 2000 reads as w2k LOL crazy huh. I have already changed that back to "XP" and "2K" for the next release. Also as of 3.5.1 I added in the os of windows 2003 it reads as "2003"