AU3 File Extension
AutoIt V3 Script
- File Type au3
- Developer AutoIt
- Popularity
- Application AutoIt v3
- Category Developer Files
What is a AU3 file?
Files with the AU3 extension are specifically tied to AutoIt V3 Script, a Developer Files type, and there are 1166 files in this category.
AU3 files are supported by Windows, Linux and Mac OS. If you need to open a AU3 file, you can use one of 6 programs, such as AutoIt v3, Notepad++ and Sublime Text.
Programs that support AU3 files
How to open a AU3 file?
If you’re having difficulty opening a AU3 file, it is often due to not having the correct software. To solve the problem, choose a compatible program from the list. Then follow the link to the official developer site, download the software, and install it on your device.
AutoIt v3, Notepad++ and Sublime Text stand out as the preferred programs to manage AU3 files effectively. To install the latest version of AutoIt v3 on your computer, visit the Jonathan Bennett website where you can download the version available for all operating systems.
After installation, your operating system should automatically open AU3 files with AutoIt v3.
Set AutoIt v3 as the default AU3 handler
Choose an app to open a file on Mac
- Right click or use Control + left click on the desired AU3 file to launch the file options menu;
- Choose "Open in Application" and click "Other";
- Next, at the bottom of the window, you will see the "Enable" menu, in which "Recommended Programs" is selected by default;
- In this menu, select "All Programs", then find AutoIt v3 and check the box next to "Always open in the application."
Set default programs for Windows
- Start by right-clicking on your AU3 file, then select "Open With" and continue by clicking "Choose another app" from the options provided;
- In the pop-up window, find and select the AutoIt v3 application from the available options;
- Make sure the "Always use this app" checkbox is checked and click "OK" to confirm your choice as the default app for opening AU3 files.
Effective solutions for AU3 file problems
There are some common issues with AU3 files that can be resolved easily by making minor adjustments to your software. Below, you’ll find these issues along with practical troubleshooting tips.
What are the methods to detect if my AU3 file has been corrupted?
AU3 developer files that have become corrupted may display one or more of the following symptoms:
- An unexplained increase in the size of the AU3 file;
- Trying to work with the archive in AutoIt v3 or other programs causes instability or program crashes;
- The file does not open correctly or displays error messages;
- While working with the file, error alerts are encountered;
- The file exhibits poor performance during editing operations in AutoIt v3;
Why does AutoIt v3 crash?
Insufficient software updates can contribute to AutoIt v3 crash. To avoid this, make sure that you have installed the latest updates for Jonathan Bennett products.
Restarting your computer can resolve numerous common problems, so it should be the initial step before changing any software-related settings.
How to repair a corrupted AU3 file?
Open the damaged AU3 file in a recovery program and select the "Repair" menu item to start the repair operation. Please wait patiently for the recovery process to finish as it will automatically repair the damaged developer files.
How to edit a AU3 file?
To make changes to AU3 files, you need specialized software that allows both opening and editing the developer files. Online AU3 editors offer fewer capabilities than applications optimized for AutoIt V3 Script.
Best AU3 editors 2026
Based on these criteria, we have prepared a list of available AU3 editors.
| AU3 Editor Software | Developer | Platforms | Overall Rating |
|---|---|---|---|
| TextEdit | Apple | Mac OS | 4.8 out of 5 (40 reviews) |
| AutoIt v3 | Jonathan Bennett | Windows | 4.7 out of 5 (37 reviews) |
| PSPad | Jan Fiala | Windows | 4.7 out of 5 (41 review) |
| Gedit | GNOME | Linux | 4.6 out of 5 (38 reviews) |
| Notepad++ | Notepad++ Team | Windows | 4.6 out of 5 (37 reviews) |
| Sublime Text | Sublime HQ Pty | Windows, Mac OS, Linux | 4.6 out of 5 (39 reviews) |