optool.exe is Opera Tool. More information can be found here.
Quote: Optool (formerly Operatool, now Optional Browser tool orOpen-in-another-browser-tool - or whatever you
like!) for MS Windows is a freeware utility which easily allows you to
open a given web site in another browser. Use it if your preferred
browser doesn't show the site properly
or if you are a developer and want to check the page in several
browsers without the hassle of cutting and pasting the URL.
Additionally, version 2.0 adds some very useful features
to navigate to the parent or root URL of the web site, or to close all windows
of the current application or even all running browsers!
Every attempt has been made to ensure the information about optool.exe is accurate but alot of malware applications try to pose as valid applications. If it is something other than what was posted above please leave some feedback in the forum.