Krrios File Format Reference

Colors
Index Files
Anim.mul
Anim.idx
AnimData.mul
Art.mul
ArtIdx.mul
Fonts.mul
GumpArt.mul
GumpIdx.mul
Hues.mul
Light.mul
LightIdx.mul
Map<n>.mul
MultiMap.rle
Multi.mul
Multi.idx
Palette.mul
RadarCol.mul
SJIS2Uni.mul
SkillGrp.mul
Skills.mul
Skills.idx
Sound.mul
SoundIdx.mul
Speech.mul
StaIdx<n>.mul
Statics<n>.mul
TexIdx.mul
TexMaps.mul
TileData.mul
UniFont[n].mul
VerData.mul

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Textures

Data File: TexMaps.mul
Index File: TexIdx.mul

You can compute the width and height of each texture by the Extra value of the index:

Sizes:

int width = (extra == 1 ? 128 : 64);
int height = width;

Data:

short[width * height] imageColors;

The imageColor array contains the image pixels loaded top to bottom, left to right.

See Also:
 - UO Color Format
 - Index Files