A file: How can I open a .A file?
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?
We hope you find this page helpful and a valuable resource.
✅ Unix AR Archive

The "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).
✅ STK Attitude

The 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.
✅ Commodore 64 SEUCK Sprite Image

The A file is a Commodore 64 SEUCK Sprite Image. The Commodore 64 (C64) is an 8-bit home computer introduced in January 1982 by Commodore International.
✅ Jabbim Data

The A file is a Jabbim Data. Jabbim is a client for communication for the XMPP/Jabber protocol, written in the Python language using Qt, PyQt and Pyxl library, which is a part of the client.
✅ Hellhog XP Game Archive

The A file is a Hellhog XP Game Archive. Hellhog XP is a 3D orbital combat shooter game for Microsoft Windows.
✅ Free Pascal Archive

The A file is a Free Pascal Archive. Free Pascal is a free, portable, open source, Pascal and Object Pascal compiler.
✅ Ada Source Code

The ADA file is an Ada Source Code. Ada is a structured, statically typed, imperative, wide-spectrum, and object-oriented high-level computer programming language, extended from Pascal and other languages.
⚠ Be careful with .a files.
It's important to know that the .a file extension can be used by various programs, not just the ones you expect. This includes potentially harmful software or malware that might create .a files. Be cautious when dealing with .a files from unknown sources.
🔴 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:
Select an app to open this .a file
It means that the operating system does not have a default app associated with the .a file type. To resolve this issue and open the file, you can take the following steps:
- Right-click on the .a file. A context menu will appear.
- From the context menu, select Open with. Windows will display a list of recommended apps.
- If the desired app is listed, select it from the provided options.
- If you cannot find the appropriate app, you may need to install software that supports the specific file type.
If you don't know how to change the default app for the .a file, check the FAQ.
🔴 Can I change the extension of files?
Changing the filename extension of a file is not a good idea. The extension of a file serves as a hint to the operating system and various software programs about the type of data contained within the file. When you alter a file's extension, you essentially modify how software applications interpret and handle that file. Every file has a specific format, also known as its file type or file format. The problem is, changing the file extension does not change the file format.
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