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:

Disk1.td0        MS-DOS/GW-Basic 3.30
Disk2.td0        Supplemental Programs

This is Tandy DOS 3.3, which is usable on other 1000-series models
(it will not run on a non-Tandy machine).
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