Microsoft Windows 1.0 Development Release #5 is a pre-release build of Windows 1.0. This build is the fifth in the Developer Release series, intended to help with application development. As such, it contains sample apps (some of them even with source code). According to install.bat, it was compiled on 1984-11-01. By default, this build is installed to C:/windows/test, with development resources in C:/windows/bin. Resources are stored in .res files externally to the executable, and some dialogs use a menu rather than OK/Cancel buttons.