.PDS is not a video file. PDS is the project file of PowerDirector. In that file, there is no video and no audio.
In the project file, there is stored, what to do with the video and audio clips. But just the 'what to do', not the video clip itself. So the project file refers to the original video clips, and the original audio clips of your project. If you saved your project file and deleted the original video and audio clips, because you thought, the .pds would be the resulting video, I must say that your video and all your work is lost. If you have a backup or a restoration of all original video and audio, copy it back to the location, where it was, while you worked on the editing and it will be back in the project.
If you want to have the resulting video, you have to produce it. There is a "Produce" in the upper area of the PowerDirector window.

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