A File

What are A files and how to open them

Are you having problems opening an A file or are you simply curious about its contents? We're here to explain the properties of these files and provide you with software that can open or handle your A files.

What is an A file?

A files have multiple uses, and Unix Archive (Static Library) is one of them. Read more about the other uses further down the page.

Unix Archive (Static Library) File

These .a files are Unix static library files. For example, when compiling the source code of a Unix program, binary object files are created with the .o file extension. The ar archive utility can bundle these object files together into a so-called "static library file", which has file extension .a.

These binary library files can be distributed to other developers, e.g., as part of a commercial third-party component to which the source code is not sold. In that way, other developers can include the functionality of the library in their own applications.

You usually do not need to edit or view these files, as they only contain information usable by the software program that uses them.

Last updated: January 25, 2025

All known file formats using extension .A

While Unix Archive (Static Library) File is a popular type of A-file, we know of 5 different uses of the .A file extension. Different software may use files with the same extension for different types of data.

ADA Source Code File

Files that contain the .a file extension are most commonly associated with the source code files for the Ada programming language.

These files contain structured, object-oriented computer code files that have been written in the Ada language. The Ada language was originally created for the US Department of Defense. Files with the .a extension are commonly used in mission-critical applications and avionics software.

How to open A files

We have identified two A openers that are compatible with this specific type of A file.

Programs that open ADA Source Code files

STK Attitude Format

Attitude files are files used by Systems Tool Kit (STK), a software system developed by Analytical Graphics, Inc.

STK is a physics-based software used by scientific experts in analyzing ground, sea, air, and space coordinates. For example, attitude files provide vehicle orientation and body frame as it travels across specific coordinates. This data will then be computed by the STK using animation and simulation.

Known users of STK attitude files include NASA, Boeing, Lockheed Martin, and the US Department of Defense.

A opener for Windows

We have identified one A opener that is compatible with this specific type of A file.

Go Package (Win-64)

We know that one A format is Go Package (Win-64). We have not yet analyzed in detail what these files contain and what they are used for. We're working on it.

While we have not verified the apps ourselves yet, our users have suggested ten different A openers which you will find listed below.

Gordi's Math Attack Data

We know that one A format is Gordi's Math Attack Data. We have not yet analyzed in detail what these files contain and what they are used for. We're working on it.

Various apps that use files with this extension

These apps are known to open certain types of A files. Remember, different programs may use A files for different purposes, so you may need to try out a few of them to be able to open your specific file.

Help us help others

File.org helps thousands of users every day, and we would love to hear from you if you have additional information about A file formats, example files, or compatible programs. Please use the links below or email us at submit@file.org to discuss further.