Error if the product name have some specific characters

[danielchicote]

I have detected that the module don't handles correctly the product names if they have characters like "?" or "ñ" in the name. I have tried to fix it but it excess my knowledge.

[Razorphyn]

I haven't checked the code, since I have come across this module randomly, but I guess is problem of "allowed filename", I would rely on some proved code to check the name, like: File::Spec, since the check would be a little complicated I guess.

The most brutal way I can think of is to try to create a file with the given name(after a first regex control) and check if it exist or do not return error and in case delete it, but I think is widely open to issues.