Many thanks for your comments. I have managed to format my DOM (the 3rd try was successful) however I'm surprised that DOMs are so sensible.

One of my DOMs for Qubide causes this message when booting my QL: fat is wrong, try rebooting... If try to format it again (with "format win1_") I get "in use". Any ideas what is the reason for this? Any ideas how can I fix it? The data does not matter, I just want to use my DOM ...

WIN_USE flp was very useful suggestion. Many thanks.

In my case the "bad file" was the problem with wrong unzip result. Please look at the answer by @José Leandro above or use the description provided by jungsi (in German however with many pictures) https://www.jungsi.de/qubide-sinclair-ql/ It is important to switch between None and QL heade...

I've managed to copy some zip images (with correct header etc.) to a DOM to use it with my Qubide. However I have no idea how to run them from "win1_" location. Simple lrun with the location of the boot file doesn't work. Help

I use Minerva 1.97 with Toolkit II.

Ok, many thanks for your answers. So I will have to find an original product at eBay or similar (Rich).

Where can I find a scan of Graywolf game documentation? Thx.