We've got a small problem with file names in SP 2013. It's probably some SQL collation thing, but would like to hear if there's a way to solve it.
We have a document with the name TestAE.pdf in a doc lib, and if we try to upload another one with the name TestÆ.pdf SP prompts that the file already exists.
Æ is a danish special character. We don't have the same issue with oe and ø.