by TryKos on DAC here is step-by-step explanation (Should work on any Windows avialable, tested on XP and 98): 1. * Get OpenWatcom preprocessor from OpenWatcom site. URL is: ftp://www.openwatcom.com/archive/zips-1.3/c_nt.zip (850 Kb only, and no need for megatonn MSVC installations at all! Thanks to ABel, who pointed this out). 2. * Unzip contents of downloaded archive into any temp directory, then cut/paste all files from "temp/binnt" to your "Fallout 2 Mapper/scripts" folder. There must be wcc.exe, wcc386.exe and 2 dll's with same names. 3. * Open file "P.bat" from "Fallout 2 Mapper/scripts" in Notepad, find string "@rem Watcom 11 users uncomment the following line:" and make next string look like that: "@..\wcc386.exe temp.c /pc /fo=temp.i /w4". Make sure you have two dots