XTAC client version works under Windows XP and Vista. For offline or online session.
Map files are usually images file in JPG format. They can be converted into tactics with XTAC.
Zip files containing a set of icons (png, gif or jpg). Must be extracted to "My Documents\XTAC Files\icons".
XTAC Server is needed if you want to host a session with your friends on your own computer.
TAC files (.tac). These files usually contain a tactic plan for a specific map.
Zip files containing a set of sounds (mp3 or wav). Must be extracted to "My Documents\XTAC Files\sounds".