File Extension LRCAT File Format Adobe Lightroom catalog file LRCAT stands for Adobe Lightroom catalog file. This was last updated in March 2012 By Margaret Rouse Browse File Extensions Alphabetically: A B C D E F G H I J K L M N O P Q R S T U V W X Y Z # Ask a Question. Find an Answer. Ask your peers a question about this file extension. Ask a Question Adobe fesses up; will fix the app it broke What will open EPS files? Converting from PSD. & JPEG files to vector?