Opera before 12.01 on Windows and UNIX, and before 11.66 and 12.x before 12.01 on Mac OS X, allows user-assisted remote attackers to trick users into downloading and executing arbitrary files via a small window for the download dialog, a different vulnerability than CVE-2012-1924.
http://www.opera.com/support/kb/view/1027/
http://www.opera.com/docs/changelogs/windows/1201/
http://www.opera.com/docs/changelogs/unix/1201/