Hello, I'm making a ROM hack of KSSU and while messing around with the files, I found that most of them are shown to be unknown file types. My main goal is just to edit the text data, but that too is unknown. I ran it through hex editors and other programs, but couldn't find any actual text; just the usual jumbled mess of code you see in hex editors. I have no idea how to find out what type of file this is or how to edit it. I'd appreciate it if someone could help me out here, as it would add a lot to my hack.

many of the files seem to be LZ77-compressed. You can decompress those files with NSMBe and check for text. there's also the possibility that the text in inside overlays, in which case I also recommend decompressing those.
EDIT: arm9.bin seems to contain a certain amount of UI text, but I couldn't find anything else. msgdata seems to be the most likely candidate for text, but it isn't LZ77 compressed and I couldn't get anything out of it.
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Nothing to say, so jadnjkfmnjamnfjkldnajfnjkanfjdksan jsdnvj m.