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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
Z1 - Extension Details
Date Added: March 12, 2008
File Extension:  .Z1
Description 1: .Z1 is the file extension linked to Zone Alarm Renamed VB file. It is Visual Basic script (or .VB file) that was renamed by the software firewall Zone Alarm antivirus and system security program software. The MailSafe of Zone Alarm is tasked with providing virus protection for Microsoft Visual Basic scripts that are sent as email attachments. MailSafe protects computer machines against viruses potentially arriving as email attachments in the form of .VBS (or Visual Basic Script) files.
File Type:   Data file
Mode: ASCII
Program(s) to Open:  Windows: Zone Labs Zone Alarm, change extension from .z1 to .vb to run the script (only if the script is known to be safe)
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