MultiEx Commander is a tool with a WinZip-like interface that can open more than 140 different game archive types, such as PK3 (e.g. Call of Duty), PAK (e.g. Quake2), BIG (e.g. C&C : Generals). Not only can all the files in such archives be extracted, MultiEx Commander also supports replacement of files in the archives by user-files (file importation), creating a powerful modification ability of existing games by MultiEx Commander.