Files with the .pd4 extension are used by the Windows Photo Gallery software application. Windows Photo Gallery allows users to view, manage and edit digital photos and videos. The PD4 files contain metadata information describing the images and videos including the name of the file, the file properties and the thumbnail information. These files do not contain the actual photo or video files themselves.
The .pd4 file extension is also used for DFSee partition table and boot sector backup files.
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If you have additional information about the PD4 file format or software that uses files with the PD4 suffix, please do get in touch - we would love hearing from you.