These are 360k 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:

Msdos.td0         MS-DOS/Basic 02.11.22
Deskmate.td0      DeskMate 01.01.00
