Windows 3.0 with Multimedia Extensions 1.0 (also called "Multimedia Windows" by some sources) is a special, multimedia-centric OEM-only release of Windows 3.0, released throughout 1991 by various OEMs. Currently available releases include Tandy for the PC in English and German, an English release for the PC by an unidentified OEM, and a Japanese release for NEC PC-98.
It includes new programs for audio and video playback, new drivers for CD-ROM drives, sound cards, displays and joysticks, screensavers, as well as new Control Panel and Help applications like the ones seen later in Windows 3.1. It is otherwise the same as Windows 3.00a, on which it's based. Its distinctive multimedia features were later incorporated into Windows 3.1. Though this release can still run in all three modes, the new multimedia related features are only available in Standard and 386 Enhanced modes.