How to open .sxr files?

[Beepeer]

So I've got a discontinued mobile game and the type of file for the assets is .sxr. Are there any programs that can open them? 
I believe the contents are both models and textures, but I'm not sure, since names like "5-0109.sxr" aren't really helpful.

[DogToon64]

https://www.vg-resource.com/thread-35985.html
https://www.filesuffix.com/en/extension/sxr
https://file.org/extension/sxr

Hope these can help! If they don't, I can try to find something else.