A daily updated filename extension database!

A file extension

The table below provides useful information about the .a file extension. It answers questions such as:

  • What is the .a file?
  • What program do I need to open a .a file?
  • How can the .a file be opened, edited or printed?
  • How can I convert .a files to another format?

Table of Contents

We hope you find this page helpful and a valuable resource!

2 extension(s) and 0 alias(es) found in database

✅ Unix AR Archive

"A" file is an Unix AR Archive. An AR archive is a single file holding a collection of other files in a structure that makes it possible to retrieve the original individual files (objects).
A format description not yet available
Category: Archive files
Application: GNU Binutils
Mime-type: application/octet-stream
Magic number: -
Magic string: -
Sample: -
A aliases:
A related links:
A related extensions:
C Source Code

Windows Command File

Executable File

Compiled Object File

Interface Definition File

Unix Shared Library

Visual C++ Preprocessed Source

INTERCAL Source File

D Source Code

Linux Shared Library Link File

✅ STK Attitude

A file is an STK Attitude. STK (Systems Tool Kit) is a physics-based software geometry engine that accurately displays and analyzes land, sea, air, and space assets in real or simulated time. An Attitude file is an ASCII text file formatted for compatibility with STK that ends in a .a extension. Attitude files can be useful when you need to provide STK with data for a vehicle to model certain unique circumstances.
Category: Data files
Application: Systems Tool Kit
Mime-type: application/octet-stream
Magic number: -
Magic string: -
Sample: -
A aliases:
A related links:
A related extensions:
STK Planetary Ephemeris File

STK Aerodynamics File

STK Azimuth-Elevation Mask

STK Body Mask File

STK Calculation Scalar File

STK Central Body Rotation File

STK City Database Main File

STK City Database Counties

STK Database Update Information

STK Ephemeris File

Other types of files may also use the .a file extension.

🔴 Can't open a .a file?

When you double-click a file to open it, Windows examines the filename extension. If Windows recognizes the filename extension, it opens the file in the program that is associated with that filename extension. When Windows does not recognize a filename extension, you receive the following message:

Windows cannot open this file:


To open this file, Windows needs to know what program you want to use to open it...

If you don't know how to set the .a file association, check the FAQ.

🔴 Can I change the extension of files?

Changing the filename extension of a file is not a good idea. When you change a file's extension, you change the way programs on your computer read the file. The problem is, changing the file extension does not change the file format.

If you have helpful information about the .a file extension, write to us!

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