A PTK file is a file that is destined to execute in PlanetPress Suite Workflow Tools. It is the file PlanetPress Design copies into the Documents folder of the PlanetPress Suite Workflow Tool installation when it installs a document into the PlanetPress Suite Workflow Tool.
The content of the PTK file is a PlanetPress Talk program that describes the document and contains all of the information PlanetPress Suite Workflow Tools require to convert the document for any output type. Thus it includes all of the information contained in the PP7 file for the document.