These files are of the Trackstar 128 utility disk that contains the software required to start an installed Trackstar 128.  One is a kryoflux image, and another is an Option Board Transcopy 5.x image.

These images are the only way to create a Trackstar 128 utility disk, as not only is the disk copy-protected, but is also specially formatted with a combination of MFM and GCR tracks that the board requires.