To change the default editor for Internet Explorer when you right click on a page and choose “View Source”, do the following:
1) Open up regedit
2) Browse to
HKEY_LOCAL_MACHINE\ Software\ Microsoft\ Internet Explorer\
3) If they don’t exist, create the following “folders” (keys) within eachother and below that key:
View Source Editor\Editor Name
4) Next, modify the default value of the Editor Name key and set it to the path of your favorite editor such as
C:\Program Files\TextPad 4\textpad.exe
5) Restart IE and you are good to go!