Tech sleuth claims to have found the oldest GUI application that still works with Windows 11 — CDPLAYER.EXE from Windows NT in November 1992 wins the prize

A technology enthusiast claims that the oldest GUI application that still runs on Windows 11 is CDPLAYER.EXE from November 1992. The app had to run on Microsoft’s newest consumer OS without modifications or emulation involved to be chosen as the ‘winner’ of their experiment. Blogger Enlyth expected something from the early NT era, as Windows 11 doesn’t support 16-bit apps, despite its strong backwards compatibility. Finding an app that is almost 34 years old that still works with a simple double-click is a remarkable result.

At the beginning of their journey to find the oldest Windows UI app that just works on Microsoft’s newest OS, Enlyth confirmed FREECELL.EXE from February 1993 would still run without issues. This game was distributed alongside the Win32s environment, designed to allow some 32-bit applications to run on the 16-bit operating systems like Windows 3.1 and 3.11. Win32s was made available in beta in October 1992, but went mainstream in July 1993.

A tip Enlyth received via a tech forum suggested that FREECELL.EXE was a candidate for the oldest GUI app remaining compatible with Windows 11. However, the blogger wasn’t satisfied with this easy win and dug through “some early NT 3.1 pre-release versions that seemed promising.” Build 347 caught the detective’s eye, specifically CDPLAYER.EXE, linked on Nov 16, 1992. That indeed seems to be the earliest GUI app that works without modification or emulation on Windows 11. But this knowledge almost defied Enlyth’s eye as their system is, like many modern systems, optical-drive-less. Luckily, adding a small DLL (cdemu.dll) allowed Enlyth to emulate a CD drive and demonstrate that the 1992-era application still functions as intended.

I wanted to verify that CDPLAYER.EXE was still usable on the latest Windows 11 release. Unfortunately, the multi-part .ARJ archive of Windows NT 3.1 that I found on Archive.org threw up errors when I tried to pick through its contents. I have a USB-attached optical drive that plays CD audio in Windows 11, so I thought I could get CDPLAYER.EXE to run without any extra DLL.

Lastly, Enlyth wanted to push the envelope a little and see what even more ancient Windows apps might work if they got some help from the Winevdm project on 64-bit Windows. “Using otvdm does feel like cheating,” admitted the digital sleuth, and we’d agree. However, being able to run 16-bit apps in Windows 11 ratcheted back the wheels of time. The result was that Enlyth managed to enjoy “a fully playable version of REVERSI.EXE dated 15-Nov-1985.” That’s a GUI-driven game distributed as part of Windows 1.01 and is roughly 41 years old.

Follow Tom's Hardware on Google News, or add us as a preferred source, to get our latest news, analysis, & reviews in your feeds.