How to make Gmail the default handler for email on a Windows PC?

I am using the Snippet Screen Capture application on Windows 7 and when I use the email to option it defaults to Exchange.

How can I change this to default to Gmail?

You can try this suggestion from a Channel9 thread on this topic -

I installed this for someone not so long ago when I rebuilt their laptop. (save as .reg)

Windows Registry Editor Version 5.00
[HKEY_LOCAL_MACHINE\SOFTWARE\Clients\Mail\GMail]
@="GMail"
[HKEY_LOCAL_MACHINE\SOFTWARE\Clients\Mail\GMail\shell]
[HKEY_LOCAL_MACHINE\SOFTWARE\Clients\Mail\GMail\shell\open]
@="GMail"
[HKEY_LOCAL_MACHINE\SOFTWARE\Clients\Mail\GMail\shell\open\command]
@="rundll32.exe url.dll,FileProtocolHandler http://www.gmail.com"
[HKEY_LOCAL_MACHINE\SOFTWARE\Clients\Mail\GMail\DefaultIcon]
@="C:\\WINDOWS\\gmail.ico"

(and put the gmail favicon in c:\windows then change your email provider in Set Program Access and Defaults

LifeHacker recommends using an application called Affixa which registers itself as the default email application on your computer and handles file uploading to Gmail.