.REZ File Extension

LithTech Game Engine Resource

Developer Monolith Productions
4.3  |  1273 Votes

What is a REZ file?

A REZ file is an asset archive used by a video game developed using the LithTech game engine. It contains meshes, textures, music, maps, and/or other game assets. Game modders often modify the assets REZ files contain to alter a game's gameplay.

More Information

LithTech is a 3D game development engine created by Monolith Productions. Monolith Productions and other video game development companies have used LithTech to create many popular first-person shooter games (and a handful of games in other genres).

The following Monolith Productions games, all developed using the LithTech engine, use REZ files:

  • Aliens Versus Predator 2
  • Blood II: The Chosen
  • Condemned 2: Bloodshot
  • Contract J.A.C.K.
  • F.E.A.R.
  • F.E.A.R. 2: Project Origin
  • The Matrix Online
  • The Operative: No One Lives Forever
  • No One Lives Forever 2
  • Purge
  • Shogo: Mobile Armor Division
  • Tron 2.0

Some other games that use REZ files include:

  • Piranha Games Die Hard: Nakatomi Plaza
  • Jarhead Games CTU: Marine Sharpshooter
  • Jarhead Games Marine Sharpshooter II: Jungle Warfare
  • Third Law Interactive Elite Forces WWI: Normandy

How to open a REZ file

You can use Dragon UnPACKer (Windows) to extract the resources a REZ file contains. Additionally, some LithTech engine games include a program named lithrez.exe, which you can use to extract resources from a REZ file.

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Programs that open REZ files


FirstClass Resource File

Developer OpenText
4.2  |  220 Votes

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.

More Information

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

Programs that open or reference REZ files

Escape Velocity Plug-in File

Developer Ambrosia
4.3  |  121 Votes

Plugin file used by Escape Velocity or EV Nova, a series of space adventure games by Ambrosia Software; adds new features, such as new ships, planets, and base stations; may also include new storylines.

More Information

REZ files can be viewed and edited with EVNEW, a free Windows utility available on the Ambrosia website. Note that this utility requires Apple QuickTime to be installed.

NOTE: Ambrosia Escape Velocity and EV Nova have been discontinued.

Programs that open REZ files

Ambrosia Escape Velocity
Ambrosia EV Nova
Ambrosia Escape Velocity
Ambrosia EV Nova

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