Files with prt1 file extension might be mostly found as slide presentation made in old version 1 Aldus Presentation program.
PRT1 file extension - Aldus Persuasion 1 slide
What is prt1 file? How to open prt1 files?
File type specification:
The prt1 file extension is associated with Aldus Persuasion 1, a very old application for Macintosh used for presentations, developed by Aldus Corporation, which was later acquired by Adobe Systems.
The product is discontinued and no longer supported.
This prt1 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.