Windows 1.0 Preliminary Version 0.50

Windows 1.0 Preliminary Version 0.50 is a pre-release build of Windows 1.0. Lucas Brooks found the logo file for this build on disk 3 of Premiere Edition on 19 June 2020. With some help from jb881122, the file  (similar to   in later builds) was recovered, as well as part of a fragmented , which includes the complete (although fragmented)   and.

This build may have been made around early June 1985, based on 's features and strings, other files found alongside it (including an earlier version of the Calendar program found on Premiere Edition and later), and directory entries found on a Tandy 2000 disk.