At the following link http://help.opera.com/Windows/12.10/en/cache.html it says to displace cache type opera:cache. When I do it goes to google search not the cache. "opera:cache" is underscored like there is a link. It opens to nothing.
As the link shows, the instructions are valid for Opera 12.10. (New) Opera Blink doesn't have opera:cache.
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