Let Windows 7 re-support folder preview playback

Attentive Windows 7 users may find a situation where a newly installed, pure Windows 7 system can be in the library or explorer mode, directly in the folder Preview (partially) AVI, etc., video files directly supported by Windows Media Player 12 (Figure 1).

But after the user installs the "all-round player" of the third party such as Storm Video, Thunder, etc., the video files that can be previewed and played can only be previewed to one. Picture, but can't play directly in the folder (Figure 2).

Unable to preview and play directly in the Windows 7 folder after installing a player such as Storm.

When I first discovered this problem, I always thought it was Windows 7 and Caused by compatibility issues between players. When trying to solve some problems, the author found a situation: video files including RMVB, VOB and other formats, Windows 7 is always unable to directly preview playback, and Windows Media Player 12 can be played directly (ie no download required) The file of the decoder's video file is only previewed after the third-party player is installed.

After repeated tests, I confirmed that this is caused by the type restrictions supported by Windows 7 for the default file format of the video. At present, Microsoft officially only supports the AVI decoding format that it publishes. For the file format supported by other third-party decoders, or for copyright reasons, Windows 7 does not support it by default, so even if the user is installing. After the corresponding decoder, the system still does not support it.

But for AVI and WMV files, after installing the third-party "all-round player", users can re-edit the file association back to the system default Windows Media Player 12.

Playing video files directly in a folder with Windows Media Player 12 under Windows 7