HaloMods "Classic" Read-only Archive

Ok, I know how to work on skins etc, but when I save, how do I save so that ic an get it back into HMT, in the map. Cuz whenever I try to put it back, it says: File must be DXT4, or 5, or something like that. When saving I made sure it was checked on that,b ut it still doesn't work...

Got any suggestions?

there are some bitmaps that you cannot work on, like the plamsa grenade.

I know that, but I had made a ghost and warthog skin, but how do I save them so that I can import them back into the map?

just save them as the new file type, like save as the same DXT as the one you are injecting it over.