Windows 4.x Series

Windows 4.x is a cancelled version of Windows 94. It has versions like:
 * 1) Windows 4.0 Pre-Alpha
 * 2) Windows 4.0 Alpha
 * 3) Windows 4.0 Beta 1-2
 * 4) Windows 4.0 Beta 4.4 (Release July 1993)
 * 5) Windows 4.0 Final Beta Release
 * 6) Windows 4.0
 * 7) Windows 4.0 Plus
 * 8) Windows 4.1
 * 9) Windows 4.2 (Chinese)
 * 10) Windows 4.51