.LRDB File Extension
File TypePhotoshop Lightroom Database
This file is saved in a binary format, which requires a specific program to read its contents.
What is an LRDB file?
Data file created by Adobe Lightroom version 1, the first installment of the photo management application; stores information about a collection of images that have been imported into the software; enables storage of organized photo data.
NOTE: Later versions of Photoshop Lightroom use .LRCAT files for photo catalog information.