[DCH3416]

Windows doesn't need explorer to actually function, it's just another component that adds optional extras to the desktop environment such as the task bar and desktop icons. Kill explorer.exe, your desktop and taskbar disappear, but programs still operate and can be manipulated and minimized, just in a more Win3.1 style flavor. A file browser window can be called directly without the explorer shell running, "explorer.exe /e".

Problem occurs when you have programs that dip into explorer's shell components expecting them to be running when that might not be the case. For that case you couldn't fully turn explorer off if you were, for example, trimming down a modern version of windows.