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.MOD - The general format for 3d models within the engine. (Can be read as a text file and modified.)
.lvl - Level data file. (Can be read as a text file)
.lgt - Level lighting data file. (Can be read as a text file and modified.)
.tex - Texture data file. (Can be read as a text file and modified.)
.gmt - Game Material data file. (Can be read as a text file and modified.)
.vmt - Visual Material data file. (Can be read as a text file and modified.)
.car - Actor/Object data file. (Can be read as a text file)
.spo - SuperObject Hierarchy data file. (Can be read as a text file)
.mem - Memory Limit data file. (Can be read as a text file and modified.)