Oldest GUI application that still runs on Windows 11

A developer discovered that FreeCell.exe from February 1993 is the oldest GUI application that runs natively on Windows 11 without modifications, at nearly 34 years old. Through further investigation of early Windows NT builds, they found CDPLAYER.EXE from November 1992 that also runs on Windows 11, making it slightly older at almost 34 years. Using emulation software, they also demonstrated that even older 16-bit applications like Reversi.exe from 1985 can run on Windows 11, though this requires additional tools beyond native Windows support.