Windows 1.03

Windows 1.03 is a minor update to Windows 1.02, released in mid-1986. It succeeds both 1.01 and 1.02 as a universal release in the US and other markets. It features additional device drivers, an improved SDK and updated Control Panel, Reversi, Write, and Paint to 1.03, the rest is 1.02. There are twelve different versions of 1.03 with timestamps ranging from summer 1986 to late 1987. This version also has a check/debug version dated to December 1986.

As the same thing in Windows 1.01, it is designed to run on MS-DOS 2.11 to 3.31. If it is loaded on MS-DOS 4.00 to 7.10 (without using  on   in MS-DOS 5.00 to 7.10), it will crash on startup. When this happens, it will display a bunch of random symbols on the bottom of the boot screen.