The extracted files are not in an actual .fbx format, but instead are, at a guess, some other form. I am not enough of an expert to be able to give further guidance past that simply information, though. I do believe, however, that there may be some mention of this somewhere in this thread.
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Programs that are related to this or that game.
Hey! It seems like something has changed on Warframe's side of things within the last 6-12 months. EvolutionUnpack is able to successfully convert the contents of the .Misc.cache files, but not the .Misc_en.cache files! This leaves a lot of files inaccessible! I love being able to use this program, and I dearly hope that GMMan is still around in some form, so that he might agree to take a look and hopefully identify where it's failing.