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Go to Preferences > Advanced > Downloads, uncheck "Hide file types opened by Opera" and search for "exel" and/or "exe". Something with one or both of those associations is probably broken. I don't know how they are broken, so I don't know what you'll need to do to fix them though.
Opera 12.15 - Win 8 Pro x64 All my Opera tools -Tab Vault: Save tabs for later -AutoStack: tabs opened from a stack stay there