When you double click PDD files on computer, the associated program will be launched to open the selected PDD file. But you can change it to any program at your pleasure.
a) Select a program to open PDD files on Windows
Right-click on the PDD file and go through 'Open with' > 'Choose default program'. In the pop-up windows, choose a program as the PDD file opener. If you decide to always open PDD files with the program, only check the option 'Always use the selected program to open this kind of file'.

b) Select another application to open PDD files on Mac
First Get Info about any one of PDD files by right-clicking or Command-I, and click 'Open with' arrow to choose a program to start your PDD file. Click 'Change All' button to set the selected application as the default PDD file opener app.

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