I was trying to get web browser to launch putty in ssh mode when clicked on a link ssh2:// . I tried numerous hack as mentioned in stackoverflow and msdn. But I couldn't get it to work on my url ssh2:// . Then I found his customurl application in codeplex. This application is very simple and works as shown in the site. For me when i clicked on the custom url, i had to accept many warnings dialogue from windows to allow custom url to handle the url and i clicked on the check box of not to show this warning in future clicks. After that it is working fine. Be careful when you are using variables. I wrote %HOST% instead of %Host% and the application throw error of unable to find %HOST%.