https://forums.opera.com/topic/3252/many-ssdfp-files-in-opera-stable-since-opera-22
Many "ssdfp..." files in Opera Stable since Opera 22 | Opera forums
Jun 6, 2014 - Since installing Opera 22, I noticed that the folder "c:\Users...\Opera Software\Opera Stable" contains a growing number of small files like...
in operamanyfilesstablesince