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  • ...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 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?
  • ...that Windows Server 2003 has been renamed four times during development, before settling on its final name?
  • ...that Windows 98 build 1387 has a hidden button in display properties to enable title bar gradients, and is also the first build of Windows to support this feature?
  • ...that no build of Windows Vista (including pre-reset) actually used or even included the widespread Longhorn sound scheme?
  • ...that Windows 95 build 58s includes a hidden tabbed mode in the Cabinet?

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Windows 1.0 Development Release #5 is a pre-release build of Windows 1.0. This build is the fifth in the Development Release series, intended to help application developers design and develop their applications to work with Windows. According to INSTALL.BAT, it was compiled on 31 October 1984 and likely released in the following weeks. It is the earliest available build of Windows so far, although earlier releases are known to exist in private collections.

By default, this build is installed to C:\WINDOWS\TEST, with development resources in C:\WINDOWS\BIN. Also included are several mockup applications, namely Chart, Graph, PPDemo, Sample and Template, along with their source code. The overall UI design philosophy was not finalized yet, which can be clearly seen in dialogs - some, like the standard Windows dialogs, use a menu bar rather than OK and Cancel buttons, while custom dialogs tend to look completely different.

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