The MS-DOS Executive was a quasi-graphical shell that shipped in Windows 1.0 (see https://en.wikipedia.org/wiki/Windows_shell#MS-DOS_Executive https://en.wikipe

The MS-DOS Executive was a quasi-graphical shell that shipped in Windows 1.0 (see https://en.wikipedia.org/wiki/Windows_shell#MS-DOS_Executive https://en.wikipedia.org/wiki/Windows_shell#MS-DOS_Executive). Windows "Program Manager" was strictly a "launch pad" to start applications and didn't support arbitrary file management. "File Manager" handled file management operations (though if memory serves you could launch applications from it). Finder integrated file management and application launch. Arguably this wasn't integrated in Windows until the Windows 95 Explorer shell came along.