AC File Extension
AC3D Geometry Format
- File Type ac
- Developer Inivis Limited
- Popularity
- Application AC3D
- Category Text Files
What is a AC file?
The AC extension is related to AC3D Geometry Format and is classified in the Text Files category, which contains 315 files.
Inivis, the developer of the AC3D Geometry Format (AC), has released file format and programs designed to handle them.
AC file support extends to various operating systems, including Windows, Mac OS and Linux. There are 6 programs available to open a AC file, including popular tools like AC3D, Blender and Afanche 3D Viewer.
Programs that support AC files
Mac OS
Linux
Online Services
How to open a AC file?
If you are having trouble opening a AC file, it usually means the right software is not installed. Choose a program from the list that matches your operating system. Next, visit the official website of the developer, download the software, and install it on your device.
Thanks to their popularity, AC3D, Blender and Afanche 3D Viewer are often the go-to programs for managing AC files. If you want the most recent release of AC3D, head over to the Inivis site and download the version designed to run on all platforms.
After completing the installation, AC files should be recognized by the system and linked to AC3D.
Set AC3D as your default AC viewer
Set default app to open files on Mac
- Right-click or Control + left-click on the desired AC file to open a menu of available actions;
- Choose "Open in Application" and click "Other";
- In the lower section of the window, you’ll find the "Enable" menu, with "Recommended Programs" pre-selected as the default option;
- Select "All Programs" in this menu, and then search for AC3D. Check the box next to "Always open in app" to make sure it’s the default option.
Change a default app in Windows
- To get started, right-click your AC file, then choose "Open With" and select "Choose Another Application" from the context menu;
- From the list of applications in the pop-up window, find and select AC3D as your desired application;
- Check the "Always use this app" checkbox, and then click "OK" to set your chosen app as the default for opening AC files.
Solving Common AC File Challenges
While AC files can sometimes present difficulties, most problems can be resolved quickly with minor software modifications. Check the tips below to help solve them.
What Causes AC3D to Crash Frequently?
Insufficient software updates are a likely cause of AC3D crashes. Be sure to install the latest updates for Inivis products.
A simple restart of your computer can often fix many common problems, which is why it is the recommended first step before making any adjustments to your software settings.
How can I restore a damaged AC file?
Start a data recovery program and open the damaged AC file. Then, choose the "Repair" option from the menu. Allow the recovery process to complete, which will automatically repair the damaged text files.
How can I determine if my AC file is damaged?
Characteristics of corrupted AC text files can include:
- AC3D or other programs stop responding or crash when trying to handle the file;
- Error notifications appear during file manipulation;
- When opening the file, errors occur or the inability to access its contents;
- Unexplained AC file size inflation;
- Editing the archive in AC3D is hampered by poor overall performance;
How to edit a AC file?
To modify AC files, you need to install special software that makes it possible to open and edit text files. Online AC editors are more restricted compared to software designed for AC3D Geometry Format.
Best AC Editor Software in 2026
Taking the above factors into account, we have selected a list of AC editors currently available.
Convert files to and from AC
If working with a AC file is challenging, one solution is to convert it to formats like DAE, 3DS, S, BLEND, ATD or other supported formats.
After converting a AC file, some capabilities may be limited, but you can often convert it back to the original format.