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A single-file Python utility for listing, validating, extracting, and rebuilding LTAR v3 / .Arch00 archives, including those used by F.E.A.R. It uses only the Python standard library and requires Python 3.10 or newer.
python arch00tool.py list Some.Arch00 -v
python arch00tool.py test Some.Arch00
python arch00tool.py extract Some.Arch00 extracted/ --pattern '*.dds'
python arch00tool.py repack Some.Arch00 Some.modded.Arch00 --replace-dir mod/
python arch00tool.py test Some.modded.Arch00The source archive is not modified. Repacking preserves unchanged file payloads,
- Getting started and modding workflow
- Command-line reference
- LTAR v3 layout as implemented
- Internals and function reference
- Safety, limitations, and troubleshooting
These pages describe the current arch00tool.py, not a complete official format specification. Built-in help is available through python arch00tool.py --help and python arch00tool.py <command> --help.