Windows Explorer add-ons or replacements...

Talking about Microsoft's File Explorer (before that Windows
Explorer, before that File Manager).

This one "Q-Dir" appears to be popular...

http://www.softwareok.com/?seite=Fre...ir/Screenshots

Since I'm doing some serious file manipulation, what I really need is
for this idiotic Microsoft Windows Explorer program to follow the
highlighted folder (I suppose Classic Shell has that option). While
I'm at it, tabbed file management sounds good too.

When the folder in the left-hand pane is highlighted, its contents
should show up in the right-hand pane. But if you use the cursor to
move through folders in the left-hand pane, the contents do not show
up in the right-hand pane like they should since the freaking folder
name is highlighted. This has been broken since after Windows XP.
Microsoft management jerks.