RAR is an archival format. You can use WinRAR and other tools to uncompress
RAR files, and THEN try to play 'em back if they are indeed media files.

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(speaking for myself and doing this in my free time)
See http://www.zachd.com/pss/pss.html for some helpful WMP info.
Following up to your post with the resolution is good netiquette.
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Now Playing: "Pressure Point" by "The Zutons" in Windows Media Player.
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>i have error message num 80040256 i can,t play media which has extention
>.rar
> & i get this error (can,t play back >file format is not supported