Resource file used by OpenText FirstClass, a conferencing and emailing program that enables collaboration and communication between users; contains resources that customize the FirstClass interface; includes pictures, forms, icons, and sounds.

NOTE: REZ files are similar to .FC files except they only hold resources for the FirstClass interface instead of login data.

A REZ file is a resource file used by first-person shooter games that are developed with the Lithtech gaming engine. It contains game content, including meshes, textures, music, maps, and other game objects. REZ files are commonly used to modify game content.

REZ files are used by the following Monolith games: Aliens vs Predator Aliens vs Predator 2 Blood II Condemned 2: Bloodshot Contract J.A.C.K. F.E.A.R. F.E.A.R. 2: Project Origin The Matrix Online Noone Lives Forever Noone Lives Forever 2 Purge Sanity: Aikens Artifact Shogo: Mobile Armor Division Tron 2.0 Other examples of games that use Lithtech resource files include: Sierra Entertainment Die Hard: Nakatomi Plaza Jarhead Games Marine Sharpshooter Jarhead Games Marine Sharpshooter 2: Jungle Warfare Jarhead Games World War II Sniper: Call To Victory Valumedia World War II: Normandy Many REZ files may be modified using Dragon UnPACKer or Game Extractor. They may also be extracted using the program lithrez.exe, which is bundled with many Lithtech games. NOTE: The Lithtech gaming engine was originally developed jointly by Monolith Productions and Microsoft.