File Extension Library

.REZ File Extension

  • Developer by: Monolith
  • Category: Game Files
  • Format: Binary

What are .REZ files and how to open them?

Can't open .REZ file? Are you wondering what it contains? On our site we will explain to you what this file is, what it is used for and what software opens the .REZ file.

What is a .REZ file extension?

.REZ file extension is created by Monolith. .REZ has been classified as Game Files. The format of .REZ file is Binary.

.REZ is Lithtech Game Engine Resource 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.

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.

List of all softwares that can open the Lithtech Game Engine Resource File
Dragon UnPACKer
SmileGate Crossfire
File Type 2:

Escape Velocity Plug-in File

Developer by: Ambrosia 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.

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.

List of all softwares that can open the Escape Velocity Plug-in File
Ambrosia Escape Velocity
Ambrosia EV Nova
Ambrosia Escape Velocity
Ambrosia EV Nova
File Type 3:

FirstClass Resource File

Developer by: OpenText Category: Data Files

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.

List of all softwares that can open the FirstClass Resource File
OpenText FirstClass
OpenText FirstClass

How to fix problems with .REZ files

  1. You need to update the application that you normally use to open .REZ files. Only the latest version of the software supports the current .REZ file format
  2. You need to check the .REZ file for viruses. To do this, you need to scan it with a popular antivirus (Norton, Nod32, Kaspersky, Dr.Web, etc.)