Windows 1.xx

Windows 1.xx is a pre-release build of Windows 1.0 shipped by Compudata (later renamed to Tulip Computers) in early fall of 1985 with their first iteration of the Tulip System PC Compact, and is thus also one of the earliest OEM release of Windows 1.0. It was eventually found by ultrawindows and released on BetaArchive on 2019-03-02.

Overview
The base of this build was compiled on or around 1985-09-03, Compudata added additional keyboard layouts on or around 1985-09-23, and later updated  (setup version 1.xx is probably from 1985-09-25, while version 1.xy is probably from 1985-09-30). It is unclear if setup version 1.xx was also released before it was updated to 1.xy soon after, but since the Windows Upgrade Kit to version TC 1.00 (from 1986-02) explicitly mentions "Windows SETUP, version 1.xx (or 1.xy)", it can be assumed it was.

The included applications are from late 1985-08 and early 1985-09, and are already branded as "version 1.01" in the About box, though the floppy disk labels reads "APPLICATION version 1.xx". The origin of the "1.xx" (and "1.xy") designation is still unclear, the original user guide by Compudata never mentioned this designation at all. The Windows Upgrade Kit to version TC 1.00 says the following:

This document describes the way to upgrade your Microsoft Windows version 1.xx program diskettes, supplied with your Tulip pc compact or Tulip pc extend microcomputer.

Although this build contains a  file on the first disk and setup will ask for the Write disk at the end, Compudata apparently didn't include it with this build. Windows Write was instead included as part of the upgrade to version TC 1.00, which creates an entirely new Write disk.

Different floppy sets
The original disk set from 1985-09 that was uploaded to BetaArchive was branded with the Compudata logo and came with a comprehensive user guide featuring a lot of screenshots of an earlier build, most likely from around 1985-06. A later set from 1986-01, with identical part numbers, was branded with the Tulip Computer logo instead and came with an updated user guide as well.