MPO and MPF - Multiple Picture Files
File Juicer can extract the JPEG photos inside. Just drag and drop to File Juicer and they will be extracted.
MPO files are JPEG images with support for having more than one picture in a file. This is used for stereo images where appropriate viewers can use both images and normal jpeg viewers can fall back on viewing the first image.
The format has been specified by CIPA, the Camera and Imaging Products Association, in 2009
The format gained use with the Fuji Real 3D, Sony Cyber-shot DSC-TX9, Panasonic Lumix DMC-TZ20 cameras and the HTC Evo 3D smartphone.