WAL
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WAL is a texture file format used by Quake II to store brush textures. A single WAL file contains one miptex, as well as three metadata values. The first two metadata values are bitflags, indicating information about a brush's face (surface flags) and a brush's contents (content flags). The third metadata value is an integer value, usually used for determining the brightness of texlights.
The surface flags and content flags found in WAL files would serve the basis for the material map compile flags used by Source 1.