Modular Windows

Modular Windows was an embedded version of Windows 3.1 which was used on the Memorex/Tandy Video Information System (VIS). Build 592 would be its RIM and only known build.

It has been claimed that Microsoft created a new, incompatible version of Modular Windows ("1.1") shortly after the VIS shipped, however no products are known to have actually used Modular Windows 1.1.

Succesor
The development history of Modular Windows ended with WinPad within Windows 95. However, WinPad would be scrapped in favor of Windows CE.

Legacy
Because of lack of information, and lack of awareness, this Windows version is ignored by many.