The .pdr file extension is most commonly associated with Windows port driver files. These files allow USB devices to be recognized by the Windows operating system. They are similar to VXD files that are used by other computer devices.
The .pdr file extension is also used for SymbianOS Printer resource files.
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If you have additional information about the PDR file format or software that uses files with the PDR suffix, please do get in touch - we would love hearing from you.