Files with zdp extension can be most often found as label designs prepared and saved using the DesignPro professional labeling software.
ZDP file extension - DesignPro label design (version 3.5 to 4.0)
What is zdp file? How to open zdp files?
File type specification:
File extension zdp is related to DesignPro, a professional software for creating of labels, developed and sold by Avery for Microsoft Windows and macOS (OS X) operating systems.
A .zdp file contains label design created and saved in the version 3.5 or 4.0 of Design pro.