A 1985 Windows 1.0 pre-release build from Tulip's predecessor CompuData just landed on the Internet Archive

Windows 1.0 is the version everyone knows from screenshots and almost nobody has run. A new upload gives retro fans a very early copy to boot.

The Internet Archive’s description says “Windows 1.xx is a pre-release build of Windows 1.0 shipped by CompuData (later renamed to Tulip Computers) on September 3, 1985 with their first iteration of the Tulip System PC Compact and Advance/Extend.” It adds that this makes it “one of the earliest OEM releases of Windows 1.0.” The publisher is listed as Microsoft, the publication date as 1985-09-03, and the topics as Windows, Microsoft and 1985.

The files are small enough to feel like the period. The item totals 1.8MB, and the disk images are five 360K floppies named Disk01.img through Disk05.img, which is the size of a standard 5.25-inch PC floppy of the time. The page also offers an item tile, a PNG preview showing the desktop and a torrent. The uploader is the Operating Systems Archive, in the Community Software collection, and the item was added on November 11, 2026. The page labels the item CC0 1.0 Universal, which is the uploader’s own metadata and not a statement from Microsoft.

What the listing does not say matters just as much. It doesn’t describe what differs from the final Windows 1.0, doesn’t list a build number, and shows no reviews or views yet because it is a day old. So the safe claim is narrow: this is an uploaded set of disk images described as an OEM pre-release, and nothing in the item page tells you how it behaves.

The practical route for anyone curious is an emulator or a virtual machine. Floppy images like these can usually be mounted in a PC emulator, but the archive page doesn’t say what hardware or DOS version the build expects, so expect some trial and error. Because the page makes no claims about what’s included beyond the five disks, treat any setup guide as something to verify against the disks themselves.

A 1.8MB operating system is a good test of what we think we remember about early Windows. The desktop screenshot on the item page is the quickest check.

The Tulip connection is a nice detail too. The archive says CompuData later became Tulip Computers, and that the build shipped with the first Tulip System PC Compact and the Advance/Extend, so this is a record of what one hardware maker bundled with its first machines. Nobody outside the original disks can confirm more than that, which is exactly why the upload is worth having.

Five floppies, one very early Windows.