I believe this "(" is possible to use, but unconventional, which may result problems depending on the language of the program is using to read your content. My advice is: stick to the conventional: we normally use "_" to link words (which is similar to a space) or a simple dot "." Or, in the case of Construct, i usually do something like this: "family_object_instance(or index, using a number).
* " [ ] : ; | = these are the other ones i can remember by head, and can't recommend using for naming files.
Alright, so to the actual problem: i saw you're from Poland. There is a lot of characters with accents in the polish alphabet - even on consonants. Am i right? If so, if i were you i would try and get rid of them.