For me, this means lauching the browser (aka Internet Explorer) by pressing the Start button > followed by "r" for Run > followed by "iexplore www.address.com"
"iexplore" magically launches Internet Explorer.
So now that I'm a full blown Firefox convert, I needed a mechanism to launch firefox even though I typed in due to bad habit "iexplore".
I tried various bat files, then finally stumbled across the registry change that maps "iexplore" to Internet Explorer :-
[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\App Paths\IEXPLORE.EXE]
@="C:\\Program Files\\Internet Explorer\\iexplore.exe"
"Path"="C:\\Program Files\\Internet Explorer;"
All I had to do then was modify this entry to point to firefox :-
[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\App Paths\IEXPLORE.EXE]
@="C:\\Program Files\\Mozilla Firefox\\firefox.exe"
"Path"="C:\\Program Files\\Mozilla Firefox;"
Now I can continue to use iexplore but launch firefox instead!