Harman Kardon BDP 10 Owner's Manual page 28

GLOSSARY
WMA Files: WMA (Windows Media Audio) is an audio compression
format developed by the Microsoft Corporation for use with its
Windows Media Player. WMA files may be created with greater
compression than MP3 without sacrificing audio quality so that even
more songs may be recorded on a disc. There have been a number of
versions of Windows Media, and the BDP 10 is compatible only with
files that end in the "wma" extension and that were recorded using the
Windows Media Series 9 encoding, up to 320kbps.
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