The 800K floppy drive will perform as a 400K drive if the 800K driver is not installed.

MacWorks XL 3.0 and below does not support 800K functionally. MacWorks Plus and MacWorks Plus II natively support 800K functionally automatically.

Lisa Office System 3.0 and newer supports 800K functionality with a driver.

The driver can be found here.

The 800K driver floppy supplies the driver installer utility.