New update out as of August 26 http://www.faststone.org/FSViewerDetail.htm

Version 5.8 (August 26, 2016)
*Supports dual instances. Now you can run two image viewers at the same time, drag and drop images between them,
and compare images from different folders side by side
*Added an option to show/hide filenames when comparing images
*Added right-click menu on EXIF list to Copy EXIF to Clipboard
*Displays MP4 and MOV thumbnails on Windows 10
*Updated RAW format library
*Many other small improvements and bug fixes