Shell Commands/PFSSetFileNameSize

PFSSetFileNameSize - Sets or retrieves the maximum length of filenames

VOLUME/A, FILENAMESIZE/N

VOLUME       - The volume on which the filenamesize is to be changed or
               displayed.
FILENAMESIZE - The new filenamesize. Must be between 31 and 107 and must
               be larger or equal the current size. If not supplied, the
               current filenamesize will be displayed.

WARNING: Use this command carefully, the filename length can only be increased, not reduced. The only way to set the filename length back to 31 after it has been increased is by reformatting the disk.