A few of my Litematica files won't work after I extracted them from the bowels of deleted files. the reason for this is obvious, but I don't know how to get back my original litematica files.

I'm closing this as this is not an issue in the mod, if the files were simply corrupted externally.

I can send them over if anyone wants to tinker with them, as they are no good to me.

Well yes without the files there is no possibility I could even try to do anything about this. Do you mean you used a file recovery program on them, or what exactly? If the NBT data was changed/corrupted due to being overridden by other files and then restored by a program, then it's most likely that they are corrupted beyond repair.