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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:
ABCDEFGHIJKLMNOPQRSTUVWXYZ
PBT - Extension Details
Date Added: January 01, 1970
File Extension:  .PBT
Description 1: File extension .PBT is linked to the Microsoft Source Profiler binary table file. The Microsoft Windowsbased source profile capable of running from a Microsoft Windows operating system icon or from the command line is called PROFILE.EXE. Names of batch files used in profiling Windowsbased applications end with "W. Run the batch files from the prompt for MSDOS as each of them starts or launches Windows. Users can also profile Windowsbased applications in Windows.
File Type:   Binary file
Mode: Binary
Program(s) to Open:  Associated applications: Visual C++, Microsoft Windows
Common:
Extension: