FastPictureViewer is described as 'award-winning image viewer for the Windows platform, specifically Windows 7, Windows Vista and Windows XP' and is an app in the Photos & Graphics category. There are more than 100 alternatives to FastPictureViewer for a variety of platforms, including Windows, Mac, Linux, iPhone and iPad. The best alternative is IrfanView. It's not free, so if you're looking for a free alternative, you could try nomacs or darktable. Other great apps like FastPictureViewer are XnView MP (Free Personal), FastStone Image Viewer (Free Personal), Adobe Lightroom (Paid) and XnView (Free Personal).