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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
PLO - Extension Details
Date Added: January 01, 1970
File Extension:  .PLO
Description 1: .PLO is the extension tied to the 3D Home Architect Foundation Floor Plan. It refers to the building foundation floor plan that the home design program called 3D Home Architect Deluxe created. PLO files are useful for storing a houses structural foundation layout. The actual layout of the ground floor is stored in files with the .PL1 extension.
File Type:   3D Image file
Mode: Binary
Program(s) to Open:  Windows: Broderbund 3D Home Architect Deluxe
Common:
Extension: