Description of the problem
Why was the .dxd.pag file created in DewesoftX data directory and what is it for? When does it appear?
Description of the solution
PAG file was added with the "Open data file during storing" feature and is always shown inside DewesoftX data directory during the storing process. After the storing has stopped it disappears. The file contains the meta data for the second instance of Dewesoft to know how much data it can access.