Back in 2014 I received an email from Matthias who has been experimenting with Windows.
Just a short note :
I am running Windows 7 on this thin client both from a hard drive (2.5") and from a CF card.
In order to get Windows 7 to run from the Compact Flash card I had to install it onto the hard drive first, and then do a sector-by-sector copy across to the Compact Flash card. (I tried several different installation methods but this one seemed the fastest one).
To do the copying I used EaseUS backup of which there are various versions including a free one..
Of note is that Windows 7 was the only (full) Windows version that installed without complaining about anything. I also tried Win 95, 98, 2000, NT, XP but to no avail.
Thank you Matthias for that information.