Checkink HKCU hive key first make sense. You can have more than one user on PC and each user can pick their own default email client.
>
>Thanks. That's correct except on Vista (on the machine I am using) there is another key in
>HKEY_CURRENT_USER\SOFTWARE\Clients\Mail
>
>It would appear that's that one Vista is updating consistently. Changing default email client didn't change the value in HKEY_LOCAL_MACHINE entry.
>
>I take I hove to look in current_user first. Any comments will be much appreciated.
>
--sb--