@elextr Do you know how `filetype_extensions.conf` is processed? Both Prolog and Perl use the same extension `*.pl` (together with some other extensions) and I added it to the extensions list assuming that Perl will get higher priority than Prolog because it's above it in the alphabetically sorted list. I think `pl` should stay as the default extension for Perl which seems to work with this change, I'm just not sure if it's something I can rely on (alternatively I could remove `pl` from the prolog extension list).