XRF Material file format
Note that some programs may split the MAP tag across three lines:
The single line form is preferred.
Map files are almost always of type JPEG (*.jpg) though I'm told PNG is acceptable (but not GIF).
Texture dimensions should normally be powers of two e.g. 64, 128, 256, 512.
Note that a 512*512 material will be converted down to 256*256 before display, so map files should only be bigger than 256*256 when animation is used.