by RoJeC on 23 Jun 2016, 10:06
Not sure what you want.
.crossdb is the database collection of Cross. So by itself has no relation with MP3 as MP3 is a format of a single track.
With Cross you can import and export playlists if this is what you want.
You can also import into Cross by using the Explorer or the menu. In explorer select the track or folder you want to import, drag it to the Cross button called 'collection' and all tracks of the (sub)folders will be imported (not if you select a single track)