[Heavy-matill]

It's going to look like a hellish machine  

The best thing, if we want to have versionning control, is to offer to ignore the information in brackets [...].
That way, everyone can do what they think is useful with this option; it would be ignored in the file name...

But it has to be optional, right now, we have lots of files including brackets...

AND, I gave up on dealing with versioning, there is always a member of the group who confuses. It is simpler to say "you update songs or the setlist before all meeting"

I agree, it's an advaced feature that would confuse most users

I like your approach, but would like to keep version information to control wether the file is uptodate. But I think I will make sure the version string is visibile in the PDF file/text instead of its filename.

Yes, it matches on filenames (more specifically, it determines where the file would be copied into the storage location, and if a file already exists there, it then updates the song using that file). 

Does that mean, if a file is stored inside a folder (instead of in the root directory) and the reference is not (or other way arround), they would not be matched?