PPL

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PPL files are lightmaps (per-pixel lighting) generated by VRAD for prop_static models that have generatelightmaps enabled. Unlike brush lightmaps, PPL files are always 24-bit  SDR (plus an unused 8-bit alpha channel), even when the map is compiled in HDR mode.

A PPL file can be converted to uncompressed VTF (such as for use with $lightmap) using Ficool2's proptexelvtf.exe.