With the file extension FFO file information files of image processing Adobe Photoshop are marked. This is a metadata file created by older Photoshop versions. These files are in addition to an image or project and contain information such as title and author, as well as user-defined keywords or categories. In addition, it can be used to determine who has changed something on a picture and when.
Newer version store some of this information usually directly into the image file, but you can 'file-> file info' display this information and edit. You can also import or export this data using an Extensible Metadata Platform (xMP) file.