Which program I have to use to view and modify textures?

[^Dagon^]

I have seen many mods that change textures of units, heroes, etc. Does anyone know which program to use in order to view and modify such things?

[Sir_Toejam]

I recall hearing folks saying some were using 3dstudio max to edit the models and textures. I think there was some discussion about this over on the Elrath.com forums last month.

I haven't played with the models myself.