On a Windows system, you can configure Internet Explorer 6.0 to use Vim to "View Source". Add the following to the registry. Change the path to the location where you installed Vim. [HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Internet Explorer\View Source Editor\Editor Name] @="C:\\vim\\vim60\\gvim.exe" On Vista 64-bit On Vista 64-bit, the path to use for the above registry key is slightly different: [HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Internet Explorer\View Source Editor\Editor Name] @="C:\\vim\\vim72\\gvim.exe" Thanks to Josh Poley at Microsoft for this information!