A dtp file extension is related to the Page Express desktop publishing app developed by Networked Picture Systems, Inc. A dtp file contains DTP document.
DTP file extension - Page Express desktop publishing document
What is dtp file? How to open dtp files?
File type specification:
The dtp file extension is associated with old DTP or graphics software called Page Express. Marketed by Networked Picture Systems, Inc. in 1989.
The dtp file contains desktop publishing document created in the Page Express.
This dtp file type entry was marked as obsolete and no longer supported file format.
This type of file is no longer actively used and is most likely obsolete. This is typically the case for system files in old operating systems, file types from long discontinued software, or previous versions of certain file types (like documents, projects etc.) that were replaced in higher versions of their original programs.