Hi Youneedahost,
If you're trying to play an ASF or WMV file that was encoded with the Sipro Lab Telecom ACELP.net (130) audio codec; you might not be able to use Windows Media Player to play this file until you install an updated version of this codec that's compatible with this version of Windows.
As a workaround, you might be able to play this file by using a multimedia playback program other than Windows Media Player.
Access the below link for detailed information:
http://windows.microsoft.com/en-CA/windows7/codec130
Hope this helps.
Regards, Manasa P – Microsoft Support.