Up to several seconds of audio may be lost. Every time that metadata is edited in an MP3 file that already contains lots of metadata in the file header, some audio at the beginning of the track may be lost permanently. This update addresses some issues with Windows Media Center playback, recording, and MP3 file support in Windows. 'An update is available for Windows Media Center and Windows Media Player in Windows 7 Beta. In support documents for the Windows 7 beta, the following tidbit is revealed.
This is particularly a danger to those MP3 files that you actually dished out your own cash to buy. Apparently, with every edit to an MP3's metadata (such as adding the album cover art), Windows 7 will delete a portion of the audio. And yet, on the same day as Microsoft's first attempt to release its public Windows 7 beta (January 9), Microsoft mentions that the Windows 7 beta already needs a patch.
With all the debate going on over if Windows 7 will be The One that converts XP users to another operating system, Microsoft has no room to make a bad impression.