usage : set 0 through 3 | 1 | 0 When a volume is not specified the operation updates the registry value: 0 - Enable 8dot3 ...

usage : set [0 through 3] | [ 1 | 0]

When a volume is not specified the operation updates the registry value:

    0 - Enable 8dot3 name creation on all volumes on the system
    1 - Disable 8dot3 name creation on all volumes on the system
    2 - Set 8dot3 name creation on a per volume basis
    3 - Disable 8dot3 name creation on all volumes except the
              system volume

    When a volume is specified the operation updates the individual
        volume's on disk flag.  This operation is only meaningful
        if the registry value is set to 2.

    0 - Enable 8dot3 name creation on this volume
    1 - Disable 8dot3 name creation on this volume

This operation takes effect immediately (no reboot required).

Sample commands:
  "fsutil 8dot3name set 1"      - disable 8dot3 name creation on all volumes
  "fsutil 8dot3name set C: 1"   - disable 8dot3 name creation on c: