Until recently, Chrome had the same issue. It just used a big Google Chrome logo for all associations. However, they recently fixed it to use a document icon instead (paper icon with folded corner with smaller Chrome logo in it). It's much better now and Opera should really do the same. Old, Presto-based Opera use to do that.

For a current-user install at least, changing it at "HKEY_CURRENT_USER\Software\Classes\OperaStable\DefaultIcon" in the registry might do the trick, but didn't test. You might have to embed the icon in an exe so you can point to the icon in it like Opera does with its exe by default. Also, upgrades might revert your changes.

That's basically what it's saying in https://superuser.com/a/533492/6488.

Thanks - the registry editing all looks a bit risky to me! I've created a small icon (.ico file) and just added that to the folder that has opera.exe in it - I can then just change the icons manually (as a I use each one) - Properties/Change icon/Browse - select and confirm my .ico file. Laborious but it gets rid of the over-powering "O" icons.

Thanks

Rob

For a current-user install at least, changing it at "HKEY_CURRENT_USER\Software\Classes\OperaStable\DefaultIcon" in the registry might do the trick, but didn't test. You might have to embed the icon in an exe so you can point to the icon in it like Opera does with its exe by default. Also, upgrades might revert your changes.

That's basically what it's saying in https://superuser.com/a/533492/6488.