Case study

Fallout 2 Reference Edition: reverse-engineered C source of the original engine

Restores C source for Fallout 2’s Windows engine from the original binary, keeping as close to the original as possible with all its imperfections. The resulting fallout2-re.exe is a drop-in replacement for fallout2.exe that runs on the user’s own GOG or Steam copy. README says a few non-essential functions remain undecompiled; the code became the basis of the separate Fallout 2 Community Edition, and its author calls wide publication legally questionable.

Targets: Game
Category: Independent reconstruction cases
Relationship: Independent reconstruction project
Sources reviewed: 2026-10-19

Stars: 415
Last commit: 2023-01-20
Language: C

GitHub data as of 2026-11-09

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Requirements & limits

A personal Fallout 2 installation, including the GOG or Steam editions, supplies the game data. Copy the built fallout2-re.exe into that directory in place of fallout2.exe.
CMake 3.13 or newer builds a 32-bit Windows executable; CI uses Visual Studio 2019 for Win32. The project uses Win32 and DirectX interfaces.
A few non-essential functions remain undecompiled. CI compiles the executable; the repository has no tests or binary matching checks.
Sustainable Use License 1.0 permits internal, personal and non-commercial use and free non-commercial distribution. Bundled zlib and fpattern retain their own licenses.

Cite

BibTeX

@misc{fallout2-reference-edition-case,
  title = {{Fallout 2 Reference Edition: reverse-engineered C source of the original engine}},
  howpublished = {\url{https://github.com/alexbatalov/fallout2-re}},
  url = {https://github.com/alexbatalov/fallout2-re},
  urldate = {2026-10-19},
  note = {Awesome REA entry: \url{https://awesomerea.org/resources/fallout2-reference-edition-case/}}
}

Plain text

Fallout 2 Reference Edition: reverse-engineered C source of the original engine. https://github.com/alexbatalov/fallout2-re (accessed 2026-10-19). Awesome REA entry: https://awesomerea.org/resources/fallout2-reference-edition-case/

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About this entry

The description was reviewed against primary sources.

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Primary sources

README.md GitHub · alexbatalov/fallout2-re · Revision b135fc4
LICENSE.md GitHub · alexbatalov/fallout2-re · Revision b135fc4
CMakeLists.txt GitHub · alexbatalov/fallout2-re · Revision b135fc4
.github/workflows/ci-build.yml GitHub · alexbatalov/fallout2-re · Revision b135fc4
third_party GitHub · alexbatalov/fallout2-re · Revision b135fc4
https://github.com/alexbatalov/fallout2-re/releases/tag/nightly
https://github.com/alexbatalov/fallout2-re/issues/29