Users who have already installed Windows 7 should find that when use system media center; the media libaray of media center doesn’t recognize the video file of Real format at all. Real is one of the most popular video file formats so far, believing that most movies you guys watch are of Real format. With such a powerful and convenient media management tool, but cannot use, would it be annoying? Next I will show you an easy way to break through the limitation of Windows 7 media center.
  We take .rmvb format as an example to explain the concrete steps. Open “Start”—“Run”, type “regedit”, and press Enter to open REGEDIT. And the locate to the item HKEY_CLASSES_ROOT, create a key named “.rmvb” (if it’s already existed, then no need to create). And tehn under the created item, create a key of character string format, named “PerceivedType”, and change the value of this character string as “video”. After finishing the operation above, exit REGEDIT. Take turns to open “Start”—“Windows Media Center”--”Movie”—“Movie library”. At this moment, if there’s .rmvb format file in the monitored folder, it could be recognized by media center, and show in the list.
  To add other file formats, the process is similar to the one above, we can even export the .rmvb registry table item as a REG file. When to register as movie file of other format, we could directly change the