Opera Mail doesn't appear on the All Control Panel Items > Default Programs > Set Default Programs list. I'd like to use Opera Mail for IrfanView's email option, but can't without that default setting. Thanks for your help.

Since leaving Opera 12, when attempting to add any of several extensions, a message reports "An error occurred when installing the extension: Download interrupted." Is it likely that Norton Internet Security is interrupting the download? If so, how can Norton be configured to allow these extensions? I've tried, but can't figure out how. TIA!