When students and teachers - without a grade in IT - upload files, they use "normal symbols" like - in the naming of their files. The have no idea that these symbols have special meaning on some servers.. The files uploads correct, but - depending of the server - Moodle cannot find the file again when the users asks to download or open that file again.
When I added this to the error-tracker I got the answer that Moodle headquarters will not solve this problem.
I think this is the wrong answer: users will see it as a bug in Moodle, and from heir perspective they are right.
The symbols that may cause problems in names of files on some distribution systems, should not be allowed in the naming of files in the moodle core distribution.
regards, Ger