Pat file format

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January 2024

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PAT is a text file format used by the "mkentitypatch" tool to patch BSP entity lump. The tool does not seem to be shipped with Half-Life 2 itself (however its source code can be found in Source Engine distributions), hinting that perhaps this was a precursor system to .lmp files.

Note: Seems to be related to LMP files and BSP files, as they can be found in hl2_pak_dir

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January 2024