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* Pr: ĭnʹtərnĕts: "I hear there's rumors on the uh (pause), Internets...
what program?
Well, PPF uses PPF-O-Matic, haven't heard of DDS though. Try that.
A .dds file is a texture. You can't "apply" them. You may, however, open a map in HMT, find the texture (under the bitmaps section) and swap textures.
wheres HMT?
Halo Modding Tool. You can download it from Halomods, I believe.
No, I meant Halo Map Tools by MonoxideC. There are so many H*T's...