Yes,you're: conc in d major op 61 and not op 61a which is a transcription for piano, Y think . Perhaps you have to rename the first track ... The title of the track is too long or too complex for some players .
For example : Here i renamed the first movement (allegro ma non tropo ) and the Schubert track is just audible with aimp3 player . is it your problem ?
and now i rename the Schubert first movement trck :
Now it's possible listen to this track with Winamp which is the default media player on this pC .
Have a nice week end !