Ignoring OS files, it's probably class projects or postal files from the late 90s when I was in college. My family first bought a computer in 1982 but the jump

Ignoring OS files, it's probably class projects or postal files from the late 90s when I was in college. My family first bought a computer in 1982 but the jump from that to the DOS/Windows world didn't include carrying over any files. I did have a small program published in a computer magazine in 1985, which I have typed in and run on an emulator, so perhaps that sort of counts.