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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
PCT - Extension Details
Date Added: September 09, 2008
File Extension:  .PCT
Description 1: .PCT is the file extension linked to the Macintosh PICT format image file. Apple developed the format in 1984 for use in storing images on Mac computers, employing Apple QuickDraw technology. There are two PICT format versions available: the original PICT 1 limited to eight colors, and the newer PICT 2 format that stores thousands of colors in 24 and 32bit images. PICT images typically use the .PICT extension on Mac computers while .PCT is more commonly associated with Windows PCs. Being more flexible, .PDF format has managed to edge out the PICT format and is now more widely used for Mac systems.
File Type:   Image file
Mode: Binary
Program(s) to Open:  Windows: Adobe Photoshop, any image viewer supporting PICT images Macintosh: Apple Preview, Adobe Photoshop, any image viewer with PICT support
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