MD2

MD2 (Quake 2 model format) is a 3-D modeling format introduced in November 1997 by id Software for the Quake 2 game. It is a binary format using little endian numeric format. The later MD3 format was used in Quake 3.

Format description
(several of these are labeled 'specification', but don't seem to actually be official)
 * MD2 file format specification
 * .md2 File Format Specification
 * The Quake II's MD2 file format

Sample files

 * https://telparia.com/fileFormatSamples/poly/quake2Model/

Links

 * the quake 2 md2 file format (theory)