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entry for Hotfix for Windows XP (KB926239)
. This software update for Windows XP addresses a problem encountered when a beta version of Windows Media Player 11 is installed and Windows Media Player 10 is installed over the top.This problem occurs because the Windows Media Player 10 installation replaces files that are part of the beta Windows Media Format 11 runtime installation. Therefore, the Windows Media Format 11 runtime installation does not enable Windows Media Player 10 to play files that are protected by Windows Media DRM.