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>> A file

A file format description

Many people share .a files without attaching instructions on how to use it. Yet it isn’t evident for everyone which program a .a file can be edited, converted or printed with. On this page, we try to provide assistance for handling .a files.

2 filename extension(s) found in our database.

.a - 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 file format description:
A format description not yet available
GNU Binutils
Archive files
- / -
Unix AR Archive related links:
AR on WIkipedia
Unix AR Archive related extensions:
Binutils Linker Script
Unix Shared Library

.a - 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.

.a file format description:
A format
Systems Tool Kit
Data files
- / -
STK Attitude related links:
STK Attitude related extensions:
STK Azimuth-Elevation Mask
STK Aerodynamics File
STK Body Mask File
STK City Database Counties
STK City Database Main File
STK Calculation Scalar File

Naturally, other applications may also use the .a file extension. Even harmful programs can create .a files. Be especially cautious with .a files coming from an unknown source!

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 can't open this file:


To open this file, Windows needs to know what program you want to use to open it. Windows can go online to look it up automatically, or you can manually select one from a list of programs that are installed on your computer.

To avoid this error, you need to set the file association correctly.

If you find the information on this page useful, please feel free to link to this page.

If you have useful information about the .a file format, then write to us!