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Windows Media Player suddenly quit playing AVI files

My Windows Media Player suddenly quit playing AVI files. I've verified that the file associations are correct but when I try to play an AVI file I still get an error that says the media format is not supported. I think it may be a registry problem but have no idea where to look.

One quick way to fix complicated WMP problems is just to reinstall WMP over itself. The player can be downloaded from -- reinstalling it will force all file extensions and associated components to be re-registered. If you want to attempt to troubleshoot the problem manually, there is a very good on-line resource for troubleshooting WMP problems:, which contains a great many tips not explicitly documented by Microsoft. I have managed to solve several very thorny problems using this guide.

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This was first published in August 2004

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