I'm sorry to hear that you've been having problems, have you filed any of these problems on our issue tracker?
https://github.com/Scirra/Construct-3-bugs/issues
We try to keep on top of issues, but unless users report them there is no guarantee that we will find out about it.
I would guess that part of the file loading does not understand that file name. Try it with a simpler filename using basic characters ( a-z ). I don't know enough to recognise what those symbols are, but I would wager that they use a complex character encoding.