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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
ULZ - Extension Details
Date Added: January 01, 1970
File Extension:  .ULZ
Description 1: Files with the .ULZ extension contain data that USBlyzer captured. USBlyzer refers to a USB protocol analysis application program that features a hierarchy of linked USB devices, complete with descriptive info for each device. The info that a .ULZ file captures include transfer buffer contents, device and driver object names and URB and IRP structures data. ULZ files could also have info on I/O request packets, incoming and outgoing USB traffic, and USBrelated requests. USBlyzer can be used to export ULZ files.
File Type:   Data file
Mode: ASCII
Program(s) to Open:  Windows: USBlyzer
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