DEP files are a list of
assets that the level depends on (if I recall correctly) and basically cause
the engine to pre-load those files rather than loading them the first time
the get drawn or played or whatever.
Thats what Greg Hjelstrom (lead programmer of Renegade) said to me.
Jonathan Wilson aka Jonwil
Creator and Lead Coder of the Custom scripts.dll
Renegade Engine Guru
Creator and Lead Coder of TT.DLL
Official member of Tiberian Technologies