What is an RPLN file? An RPLN file is a plugin file used by the page layout program, InDesign, that creates page design and also porvides print publishing. it contains functions that are required to run and is located in a Required directory where the InDesign software is installed. RPLN File Format RPLN files are saved in InDesign proprietary file format and there is no further details about the internal file structure of RPLN files.
