.PEX File Extension

Merak Peep Data File

Developer Merak
4.0  |  9 Votes

What is a PEX file?

Stores data models and reports created with Merak Peep, a petroleum economic evaluation program; used to create "What if" scenarios, analyze risks and market sensitivity, forecast production levels, and estimate reserves.

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Programs that open PEX files

Merak Peep

ProBoard Executable File

Developer ProBoard
3.7  |  3 Votes

Program that can be run within the ProBoard bulletin board system (BBS); written in C/C++ using the software development kit supplied with ProBoard; often less than 50K in size.

Programs that open PEX files

ProBoard BBS system
ProBoard BBS system

Compiled Papyrus Script

Developer Bethesda Softworks
4.0  |  2 Votes

A PEX file may also be the compiled, binary version of a Papyrus script (.PSC file). It contains commands that, when triggered, cause an event to occur in a The Elder Scrolls or Fallout video game, such as Skyrim or Fallout 4. Skyrim and Fallout 4 modders have created tools that allow them to examine, edit, and add to the games' PEX files.

More Information

Papyrus is a scripting language Bethesda created for use in their The Elder Scrolls and Fallout series of video games. Papyrus scripts, which are typically written in PSC source code files and compiled to PEX binary files, are used to control in-game logic and trigger in-game events. Many Elder Scrolls and Fallout games contain Bethesda-developed PEX files.

Because Bethesda has given players access to the Papyrus scripting language, players who want to modify the PC versions of Skyrim and Fallout 4 can create their own Papyrus scripts and use them to customize the games' behavior. To do so, modders must:

  1. Write and save their script as a source code file (usually a PSC file).
  2. Use a Papyrus compiler to compile their script to a PEX file.
  3. Place the PEX file in Skyrim or Fallout 4's data/​scripts folder.

If a modder wishes to modify the script an existing PEX file contains, they must first decompile the file to its editable, source code form.

How to open a PEX file

You can use either Champollion (Windows) or PEXInspector (Windows) to decompile a PEX file to a PSC file. Then, you can open and edit the PSC file in any text or source code editor, such as Microsoft Visual Studio Code (cross-platform).

How do I compile a PSC file into a PEX file?

You can use the Papyrus Script Manager, which is included in the Bethesda Creation Kit, to compile a PSC file into a PEX file. Anyone who owns a PC copy of either Skyrim or Fallout 4 can download the Creation Kit from either Steam or the Bethesda.net Launcher.

To compile a PSC file to a PEX file:

  1. Place your PSC file in your game's data/scripts/source folder.
  2. Open the Creation Kit and select Gameplay → Papyrus Script Manager.
  3. From the dropdown list that appears, select and right-click your PSC script.
  4. Select Compile.

Programs that open PEX files


West Publisher Portable Exhibit File

Developer Thomson West
3.5  |  2 Votes

Document created by West Publisher, a program used to capture digital artifacts from legal proceedings; stores an exhibit for use in a courtroom hearing; can be distributed standalone or bundled into a .PTZ file for distribution.

Programs that open or reference PEX files

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