Set default browser, in WINE, to Firefox in Kubuntu

For a very specific test, I installed 'WINE Inteet Explorer' -- bad choice, as it didn't help with the test and it's a very poor implementation of IE (poor implementation of a poor program).

I was finally able to kill the beast (WINE IE). That was an interesting ordeal in itself.

Now though, when I click on a hyperlink in my e-mail client (TheBat! ruing under WINE), I get a message that there isn't any application associated with links.

Before installing WINE IE, links would open using Firefox ruing under Kubuntu (14.04 LTS). After installing WINE IE, links opened with that.

How do I get back to having TheBat! open hyperlinks using the default browser in Kubuntu?

I suppose it will require using 'wine regedit', but I don't know which parameters to edit to what settings.

Thanks for any help.

G-Jim