In dialog "Open file": if path to file will be with space at end file will not be opened.
I'm afraid I can't reproduce the issue through Geany's Open File dialog. Could you go in more details, and what is your platform?
Anyway, I committed a fix that fixes opening of files with leading or trailing spaces *from outside of Geany*, e.g. with a file manager. Does that fix your issue?
Closed due to no response