i have the same problem...
my sandisk DAP record and plays notes in wav files no-prob.
after i "drag-drop" the files into windows 2000, neither of my audio editors
plays them...
winamp says: "missing codec unable to open file"
switch says: "cannot open the file *.wav because the required ACM codec is not
installed on this PC."
when the files are taken back to the unit, it plays them.
that means the the file isnt corrupt.
what should i do? 