From the look of things, this program would make it easy to mix and match different texture packages. Unfortunately, as you pointed out, if the files do not have the _a, _rgb, or _all before the extension, your program would ignore it. This is indeed fixable by renaming them through the method above, but what a mess if I have to rename every stinking file in Djipi's Cell shaded Zelda pack. Is there any hope of expecting a future version that can check it on its own? If not, is there a way where I can check these files and rename them swiftly without going one by one?
Regardless of the answer, I still appreciate the effort that you put into making the importing of high res models easier.