Torben,
When opening an M3U playlist, mAirList still shows the previous .mlp filename in the title-bar… This can lead to you overwriting the .mlp list by accident. Perhaps it should show the M3U filename, but then offer the Save As dialog so you can then save it to the .mlp format ?
Thanks for the hint. My quick solution is to discard the file name when opening an M3U file. When you click “Save” then, the Save As dialog will appear.
Torben