The part you didn't expect was that it actually overwrote the %SYSTEMROOT%\System32 entry, which is the first path in the list, and the path which becomes highlighted by default when you open that edit window.
The part you didn't expect was that it actually overwrote the %SYSTEMROOT%\System32 entry, which is the first path in the list, and the path which becomes highlighted by default when you open that edit window.