Looking for Optima DeskTape v5.6 or v5.7.
This a really neat piece of software that mounts tape drive media on the desktop! It supports DAT and DLT, and probably others.

Unlike Retrospect, this doesn't need a separate "Advanced Driver Kit" to use DLT drives.

Managed to locate a demo version, but it's limited to a single 40MB "partition"

If you have a copy, please upload it!