Oh, yes. That's because the Famitracker port I'm using[0] is a bit old and doesn't support the newer .ftm versions. So in case the player doesn't support a given song, there's a fallback to using FTMtoMID so you can still listen to it.
This was all done before I ported Furnace Tracker (that also supports the .ftm format) so I might just use Furnace for playing them. I have to check whether it can play the newer .ftm versions.