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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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OTF - Extension Details
Date Added: August 10, 2008
File Extension:  .OTF
Description 1: .OTF is a file extension linked to the OpenTuft Tufting Design file, the general interface format for tuft designs creation that allow for processing using tufting machines. With this type of file, it is possible to weave designs into different textile products. Info included here are yarn placement, threadup as well as yarn tuft lengths. The NedGraphics tuft design software supports the .OTF format.
Description 2: The OTF file extension is tied up with the font format that Microsoft and Adobe developed. It has to do with combining various aspects of True Type and PostScript font formats. This type of file is fully scalable, allowing for font resizing without affecting or diminishing quality. Windows 2000 and later as well as Macintosh OS X systems support the .OTF file or OpenType font format.
File Type:   Font file
Mode: Binary
Program(s) to Open:  Windows: View in Windows Font Viewer, used by programs accessing system fonts Macintosh: View in Apple Font Book, used by programs accessing system fonts
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