Windows 1.0 1.03
Windows 1.0 was the first release of what eventually made it onto almost every desktop computer in the entire world. Many of you are probably unaware of this release from 1985; conceived from ideas found in the original Lisa/Macintosh and Xerox Star system, Windows 1.0 was Microsoft's attempt at a graphical multitasking operating environment for the IBM PC.
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Office Manager, which shows up on the desktop as $OFFICE.EXE,
Overlapping windows on Windows 1.0 (well kinda).
Original media of NEC PC-9800 OEM remains to be found, though two pre-installed versions are available online, one is on a Japanese format floppy disk, the other is on a hard disk image.