Windows 1.00.09

Windows 1.0 version 1.00.09 is a very late pre-release build of Windows 1.0. Disk 5 of this build, containing a pre-release version of Microsoft Windows Write and a sample document, can be found on Muleslow FTP server. The rest of the build is not available yet. The floppy disk labels designate it as "Retail Beta Release 1.00.09" from 1985-11-04.

is dated 1985-09-09, but it's otherwise identical to its counterpart from Windows 1.01 RTM. Windows Write identifies as version 0.92, and is dated 1985-11-01. It has several code differences compared to the final version (version 1.00 from Windows 1.01 RTM) and can be used in Windows 1.01 RTM.