You need to use an audio editing application. There are plenty out there. A
simple, and free, one is Goldwave (www.goldwave.com). Just open the .wma, go
to Save As, choose .wav as the format and you are done.
Quick follow-up. PowerPoint "can" embed .wav files up to 50MB, but the
default setting is for 100k (very small). Adjust the embed size by going to
TOOLS >> OPTIONS >> GENERAL tab >> make the "100" to "50000" >> click OK
In addition to what everyone else has said, depending on your version of
PowerPoint. PowerPoint can play WMA files, which are normally a lot smaller
filesize.
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