Windows 1.00.09

Windows 1.0 version 1.00.09 is a 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 the 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 4 November 1985.

is dated 9 September 1985, but it's otherwise identical to its counterpart from the Windows 1.01 RTM. Windows Write identifies as version 0.92, and is dated 1 November 1985. It has several code differences compared to the final version (version 1.00 from the Windows 1.01 RTM) and can be used on the Windows 1.01 RTM.