Bad command or file name interface, 5 letters
1980's PC's ran on it, 5 letters
Antiquated computer abbr., 5 letters
Basic PC environment, 5 letters
Basis for Windows, originally, 5 letters
Common computer interface, 5 letters
Computer environment, 5 letters
Computer operating system, 5 letters
Computer operating system of old, 5 letters
Early Gates offering, 5 letters
Early IBM PC go-with, 5 letters
Early operating system developed for PCs, 5 letters
Early PC environment, 5 letters
Environment of many old PCs, 5 letters
Familiar PC acronym, 5 letters
Forerunner of Windows, 5 letters
IBM feature from 1981, 5 letters
Interface developed for the Intel x86 family of microprocessors, 5 letters
It ended with Version 8.0, 5 letters
It helps many machines run, 5 letters
It ran before Windows, 5 letters
It ran from a C prompt, 5 letters
It was booted before Windows, 5 letters
It was opened before Windows, 5 letters
It worked from a prompt, 5 letters
It's version 1.0 was launched in 1981, initially, 5 letters
Many PCs once ran on it, 5 letters
Obsolescent PC environment, 5 letters
Obsolescent PC interface, 5 letters
Old PC installation, 5 letters
Old PC operating system, 5 letters
Once-popular platform, 5 letters
One-time PC platform, 5 letters
Operations were once commonly performed in this, 5 letters
PC operating system, 5 letters
PC operating system choice, 5 letters
PC platform released in '82, 5 letters
PC system of the past, 5 letters
Platform introduced in 1981, 5 letters
Platform unveiled in 1981, 5 letters
Platform with a FAT file system, 5 letters
Popular PC interface before Windows, 5 letters
Precursor to Windows, 5 letters
Predecessor of Windows, 5 letters
Software product until 2000, 5 letters
What we opened before we had Windows, 5 letters
What we used before Windows, 5 letters
Windows basis, originally, 5 letters
Windows grew out of it, 5 letters
Windows made it look obsolete, 5 letters
Windows predecessor, 5 letters
Windows superseded it, 5 letters