OS/5
i have a rare piece of software called OS/5, it is also on archive.org but it might be hard to find. its in a zip file but i can convert it into a .img / virtual floppy disk. OS/5 is codenamed "text based windows" and is a rare piece of shareware that almost nobody has until now.
Comments
There is a video here:
and it included download links:
http://www.amstereo.org/files/os5v10.zip
http://www.amstereo.org/files/os5v11.zip
And agreed - it's another forgotten/abandoned multitasking OS with merit.