*.CGB

[Source](https://twitter.com/trenttech/status/1165769416598020098)
>"Texture (CGB) format. So while most image file formats contain data on width/height/bpp these were just pure texture data, not even a number of textures in the files nor any barriers. Just 4 bit per pixel indexed colour textures usually with 16 bit per colour (5bit per channel) palettes at the end. "

>"CGB texture files for models usually are accompanied by an MCB file which I assumed was the mesh data... but I couldn't figure that out yet, no easy way of telling what relates to the textures in it without first knowing some textures to find. Catch 22!"