.REZ File Extension

File Type 1

Lithtech Game Engine Resource File

Developer Monolith
4.3  |  1271 Votes
Category Game Files
Format Binary

What is a REZ file?

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.

More Information

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.

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Programs that open REZ files

Updated August 30, 2017
File Type 2

FirstClass Resource File

Developer OpenText
4.2  |  220 Votes
Category Data Files
Format N/A

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

Updated April 1, 2014
File Type 3

Escape Velocity Plug-in File

Developer Ambrosia
4.3  |  121 Votes
Category Plugin Files
Format Binary

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
Updated September 13, 2019

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