What the h e c k is an .sxr file

[tama]

So basically, I got a method to extract the data from Tomotoru, but now I have another problem-

Everything's in this format. I found little to no information when looking it up, and the only results I really found were for completely unrelated formats... so I have no idea how I can open them. Judging by the size of the files and the fact that these are the only things in the directory besides the opening movie, I think they might be similar to Unity asset files, as in being archives for all the assets. Simply converting them to .zip files doesn't work, though. But this json that was also in the folder makes me think it could be something else? I'm just kind of clueless.

I doubt that anyone would know about these things, considering there's no info online, but any help with this would be greatly appreciated.