Diary Entry mapsource doesnt open gpx

Hi again, Meanwhile i did manage to convert osm to gpx using JOSM. However, for some reason Mapsource cant open the gpx file. Any suggestions why...

Diary Entry convert osm into gpx

Hi everybody, I'm new at this whole OMS stuff (great innitiative!!), but i would really like to use some of the maps that are not yet in gpx form...