BetaWiki:Featured article/2021-09

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, 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, with development resources in. 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.