[bkiziuk]

The problem I have with this is that other players (eg. VLC and PotPlayer) dont look at the .utf extension as a subtitle file. That means that each time I use those players I need to manually load the subtitles, so I was hoping you could add an option to keep using the existing file extension.

Yes, this was indeed intentional in order to allow various subtitle format to be allowed as input ones, and at the same time keeping track (by looking at extension) which subtitles were already converted.
I will see if there's any other extension that can be used.