The official stand is that Moodle can handle _any_ Unicode character in file names. Personally, I advice to use a safe character set for file names, if your files are being transported to more than one operating system / computing platform. This is an endless discussion, see "(Moodle 2.1.2) Problem with Unziping zip files that contain special characters" https://moodle.org/mod/forum/discuss.php?d=190958 for a sample (where I was called a troll for suggesting https://en.wikipedia.org/wiki/POSIX file names).
Teaching with Moodle
Prohibited Invalid or Illegal Characters in titles
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