If you are a windows scite user there is a dll which you can use to give you an "edit in SciTE" right click menu option.
download from: http://www.burgaud.com/scite-context-menu/
instructions for Windows XP: all included in the readme
copy the correct dll 32 or 64bit to your scite directory probably "C:\Program Files\wscite".
start -> run -> cmd
cd "C:\Program Files\wscite"