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The File Extension Library

What is a file extension?

Short answer: it's the set of letters after the period (.) in the name of a file.

Long answer: File extensions signify the file format of a file. It tells the operating system (OS) how data was stored in the file. Not all OS, require a file extension though. For instance, this is optional in Unix, but is mandatory with MS-DOS and Windows systems.

In most file formats the file type is actually defined by the contents (first bytes, file structure), but extensions are used to define the application that is used for opening the file.

Below is a detailed database of thousands of file extensions our team has compiled for you. Feel free to browse!


Browse all Extensions:
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PDD - Extension Details
Date Added: January 01, 1970
File Extension:  .PDD
Description 1: Store patient session info generated by the Medtronic CareLink programmer (the 2090 model is an example) on .PDD files. These files save data that a Medtronic Chronicle Implantable Hemodynamic Monitor (IHM) records. PDD files are ordinarily saved onto IBMformatted 3.5 disks so the data are easy to retrieve, in case they are needed in the future. Open PDD files from the Chronicle software by accessing "Select Model screen and choosing Devices>Other and then moving to "Chronicle 9520BRead From Disk and following the onscreen instructions that appear.
Description 2: A .PDD extension is attached to files containing images created using Adobe PhotoDeluxe. This is the entrylevel photoediting program software that managed to streamline common editing jobs or tasks. Adobe Photoshop Elements, which bears a lot of similarities with the flagship Photoshop program of Adobe, replaced this program in 2002.
File Type:   Raster Image file
Mode: Binary
Program(s) to Open:  Windows: ACD Systems Canvas, Adobe PhotoDeluxe (discontinued), Adobe Photoshop, Adobe Photoshop Elements Macintosh: Adobe PhotoDeluxe (discontinued), Adobe Photoshop, Adobe Photoshop Elements
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