These is a 1.44M disk images.  You need Teledisk to recreate the disk.
Teledisk can be found at:

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

The disks should be labelled:

Dosbasic.td0      MS-DOS/GW-Basic and Supplemental MS-DOS and
                  SmartDrive Installation Programs

These is the original DOS disk for the 1000RLX ("A" version), models
25-1452 and 25-1453.  It is unlikely to be useful on other models.
