.ATTR File Extension
File TypeiPhoto Attributes File
File format categories include Binary, Text, XML, and Zip. The format of this file type has not been determined.
What is an ATTR file?
File created by Apple iPhoto, an image editor and organizer program; contains an image's data; created to accompany an image whose attributes have been edited.
Files are located in the subfolders of the iPhoto program.
NOTE: Used by iPhoto 2 and earlier installments, not used by iPhoto 4 and later. iPhoto was discontinued and replaced by Photos in 2015.