I now have found out why - it is all about \ and / in file names.
Originally I had: 
C:\Windows\media\xxx.wav;

[download]
which failed - to make it work I needed files names of the form 
C:/Windows/media/xxx.wav;

[download]

In reply to Re^6: Playing wav files by merrymonk
in thread Playing wav files by merrymonk

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