The window is from Pspad. The additional option in the window is from an old windows explorer addon FileBox eXtender.
This addon affects all windows, but the pspad window is the only one appear twice... Until to this moment I have to detect other interactions. -- Nice program indeed <http://forum.pspad.com/read.php?2,68360,68389> PSPad freeware editor http://www.pspad.com
