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Did you know...

...that Windows 95 build 58s includes a hidden tabbed mode in the Cabinet?
...that the WarpCenter shell included in OS/2 Warp 4 build 9.012 refers itself to as Lotus SmartCenter?
...that Windows XP build 2223 had commented out code in its Business theme file that would allow the user to configure different colors based on its settings?
...that there was an E variant planned for Windows 7 in addition to K, N and KN, which didn't include Internet Explorer?
...that in 1985, Microsoft produced a multitasking MS-DOS that natively supported preemptive multitasking and would later become the base for OS/2?
...that Apple has officially released several developer releases of what would later become Mac OS X for the x86 architecture as a part of its NeXT legacy, and secretly continued to maintain the port until Tiger?

Featured article

Some of the new features introduced in Windows 3.00 MDK Version 59; much of which are multimedia-centric.

Windows 3.00 MDK Version 59 is an early build of Windows 3.0 Multimedia Edition, which was shared on 19 December 2016. The operating system is based on Windows 3.00a and implements a series of multimedia features, such as sound drivers, applications, and screen savers. This pre-release version was likely distributed at the Multimedia Developer Conference, held by Microsoft between 27 and 28 November 1990.

The build notably includes support for various device drivers such as joystick-to-mouse input translation, Sound Blaster 1.x/2.0 support, and extended display capabilities. It also emphasizes strongly on audiovisual content, as support for the MIDI and Waveform specifications were implemented alongside a dedicated media player application. Certain applications included as part of Windows 3.00a were also overhauled to take advantage of the new multimedia capabilities, and applications now support emitting sound based on specific system events. A new Control Panel application design was also introduced, and screen savers were added to help prevent screen burn-in on CRT monitors.

The build comes with development tooling and code samples that allow developers to work on Multimedia PC-compatible applications. (Full article...)