It is clear what <Set Number> stands for but <MPD Filename> could also be: 4896 - Roaring Roadsters - Roadster.mpd
and then we are going to have: 4896 - Roaring Roadsters - Roadster - 33956.dat
w.
and then we are going to have: 4896 - Roaring Roadsters - Roadster - 33956.dat
w.
LEGO ergo sum