Quake 2 Texture

Quake 2 Texture (.wal), or Quake Texture, is a raster graphics texture format associated with Quake 2, and related video games.

Format details
Although references to the format, and sample files, are easily found on the web, we have not identified any technical information about it.

It evidently contains multiple copies of the same image at different sizes. The dimensions of the primary image appear at offset 32.

Software

 * XnView
 * A C file in the Quake 2 source containing a function "R_LoadWal", which presumably reads .wal files
 * "Wally", a program apparently capable of reading from and writing to .wal files, among other things
 * A [[ZIP] file that includes a program (with source) called "Wal2TGA" that purportedly reads .wal files]

Sample files

 * https://telparia.com/fileFormatSamples/image/quakeTexture/