These are 720k disk images.  You need Teledisk to recreate the disks.
Teledisk can be found at:

    ftp://tvdog.shacknet.nu/tandy1000/system/teled212.zip

The disks should be labelled:

Dosgwb.td0        MS-DOS/GW-Basic 3.3
Desk1.td0         DeskMate disk 1
Desk2.td0         DeskMate disk 2
Emsdrv.td0        EMS driver disk
