msh: GFXMaterialShader_Template - Material Shader info
gmt: RO2_GameMaterial_Template - Game material, contains all info about the collision (e.g. can you wall run on it, is it slippery, etc.)
tfn: Font file - Maps characters onto regions of a raster/image font
wav: Sound file - originally just a RIFF WAV file, but when cooked, it was converted to a format exclusive to the game's audio engine, RAKI (Legends and above only)
tbl: Table file - Editor format that seems to hold any type of array. Uncompiled examples were found in Gravity Falls for 3DS.
tia: TagIconAssociation - Editor format that links the Tag icons to different tags. So far not found in any released UbiArt game.
ilu: Unknown editor format. Seems to contain any generic LUA code.
tbll: Unknown editor format