How to UNset vivaldi.net mailto
Under Vivaldi webmail Settings/User Interface/Browser Options there is a link to "Register protocol handler for mailto" So I clicked that link and now I want to reverse whatever it did and unregister vivaldi for mailto, but I can find no way to do it. There is no "unset" link. I can set W7/control panel/Programs/Set associations/Mailto to any mail client, for example Thunderbird, and it has no effect. Whatever the Settings link did overrides W7 defaults apparently. So how do I unset the Vivaldi protocol handler and go back to OS default for mailto?
Solved. Reinstalling the mail client, then selecting it in CP>defaults>mailto worked. IOW I can now select a mailto choice other than Vivaldi.