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Does anyone know of a free or shareware plugin for Windows Media Player that will allow me to play .ulaw audio files?

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µ-law is an old audio type mostly found in QuickTime videos. Install CCCP Codec Pack and follow the instructions from wiki below:

Go to CCCP's start menu folder -> Filters -> ffdshow audio. Select Codecs on the left side. Find the Audio Stream codec in the list, then set the Decoder column from disabled to libavcodec.

After doing the above your file (µ-law/a-law) should play.

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