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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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MPT - Extension Details
Date Added: January 01, 1970
File Extension:  .MPT
Description 1: .MST file extension is linked with PROSA Minispecification File. This is the file extension utilized by PROSA an unparalleled UML modeling tool for visual design, documentation and innovation of software applications and business processes. It offers support for business modeling, multimedia, UML modeling, text documentation concurrent web, Java and C# class header generation, SQL generation and team development. PROSA is owned and developed by Insoft Oy.
Description 2: .MPT file extension is linked with Microsoft Project Calendar File. This is the file extension for the calendar file generated/utilized by Microsoft Project a program that provides project management tools and offers the right combination of usability, flexibility and power to allow users to manage their projects more effectively and efficiently. Other features include: offers information to users while controlling projects, finances, schedules, alignment of project teams; integration of MS Office system programs that allow productivity, guided planning, powerful reporting and versatile tools.
File Type:   Data File
Mode: ASCII
Program(s) to Open:  Windows: Microsoft Project
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