If I want to delete "* .mp4" extension files in the specified directory
On the command line, into the specified directory, input del [/ q] "* .mp4 "
del command to delete a file cmd (command line) command. [/ Q] is an optional parameter that directly deleted without confirmation.
The order is completely deleted files directly from disk, not move files to the Recycle Bin. The command to delete a file, it is difficult to recover.
Into the folder found, indeed batch delete the .mp4 file folder.