How to disable internet searching from file browsers addressbar

Hello All,

Some time ago I noticed that entering a non-existing path or filenamename
into the address bar of explorer.exe would cause it to go out on the
internet to see if it could be resolved there, eventually replacing the pane
normally showing the files with a web-browser pane.

I *thought* I had disabled it (IE, tools, internet options, advanced, do not
search from the addressbar), but it turns that didn't quite work.

How do I disable this feature permanently ?

Regards,
Rudy Wieser