Windows 1.00

Windows 1.00 is the name often associated with the final release of Windows 1.0, even though there was no release with this version number - the first official release was version 1.01. However, it should be noted that some pre-release builds and applications identify as version 1.00, suggesting this was the intended version number for the first release, before the project was delayed again in summer of 1985 and the version number changed to 1.01.

There may have been copies of Windows 1.00 shipped as runtimes for applications by ISVs. A boot screen file with the branding Microsoft Windows Runtime V1.00 is available.

The Tulip Computers OEM release of version 1.01 is designated as "Version TC-1.00", though it's technically version 1.xx updated to final 1.01.

Fake screenshots and builds
Over the years, several fake screenshots and builds have appeared online, claiming to be the real Windows 1.00. These claims often relied on a false rumor that Windows 1.00 was actually released in stores in early November 1985, but was recalled due to a serious bug and soon replaced with 1.01. There is no evidence to support these claims.

One such fake build has files dated 10 November 1985, but is actually just the final 1.01 with modified version strings. It can still be found online.

Premiere Edition
There has been much debate in the community whether or not the Premiere Edition can be considered version 1.00. The build itself and its associated applications don't actually identify as version 1.00, instead using the name Premiere Edition consistently. The only trace of version 1.00 are the system files  and , but these persisted into later releases as well (as   and  ). Since the Premiere Edition was not a retail release, but rather a limited preview/beta, it should not be considered as the 1.00 release.