solved this with this solution (to apply batch file to different folders) ...
I've stuck my batch file with renaming commands in Windows folder and called it f2.bat
I already use AutoHotKey so use this script when in Explorer (XP), triggered with mouse button and r key
~RButton & r::SendInput +{F10}w
+{F10} Shift+F10 opens context menu, which contains a "
Command Window Here" entry (with w underscore)
so i'm now in Command Window (for correct folder of files required to be processed)
I key in f2 and it's done.
I'd still like to know of a way of doing this without cheating
using AutoHotKey ...