MJUGEN:
na živě jsem nic nenašel, ale tohle to spravilo do příští aktualizace:
Locate the Opera.HTML ShellEx registry branch and delete it.
[HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Opera.HTML\ShellEx]
This forces Windows to drop back to the older icon Handling code.
Next, associate .html, .htm, .mht, .mhtml to IE using the "Set Default Programs" tools in Control Panel.
Next, associate .html, .htm, .mht, .mhtml to Opera using the "Set Default Programs" tools in Control Panel.