- Open the windows 7 control panel.
- Click on Programs
- Click on 'Make a file type always open in a specific program' (the second option below the 'Default Programs' heading)
- Select the 'MAILTO' Protocol.
- Click on 'Change program...'
- Select the program that should open when you click on an email address in a web-browser.
- Click OK.
This will allow you to change how a mailto link will operate within NetSuite.