Note: When you compress a directory, the Explorer compresses all the items it contains too. After that operation, when you create an item in a compressed directory, it is automatically compressed. You can although manually uncompress an item in a compressed directory.
DIR /x
command.
HKEY_LOCAL_MACHINE\System\CurrentControlSet\Control\FileSystem\NtfsDisable8dot3NameCreation
to 1.
Doing so is useful to speed up your NTFS filesystem when you don't use DOS® applications.