.RPLN File Extension
File TypeInDesign Required Plug-in File
This file is saved in a binary format, which requires a specific program to read its contents.
What is an RPLN file?
Plugin file used by InDesign, a page layout program used for page design and print publishing; contains functions required by the application to run and is located in a Required directory of the InDesign installation directory.
Required plugins differ from optional plugins, which are located in the Plug-ins directory within the program's installation directory.