BAC File Extension

Backup Format

File Type bac
Developer Avantrix
Popularity
4.3 (39 votes)
Application REALbasic
Category Data Files
Format Binary

What is a BAC file?

The BAC extension is related to Backup Format and is classified in the Data Files category, which contains 6196 files.

AVANTRIX, the developer of the Backup Format (BAC), has released file format and programs designed to handle them.

BAC file support extends to various operating systems, including Windows, Linux and Mac OS. There are 2 programs available to create a BAC file, including popular tools like REALbasic and PowerBASIC.

Windows

Mac OS

REALbasic

Linux

REALbasic

How to open a BAC file?

If you are having trouble opening a BAC 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, REALbasic and PowerBASIC are often the go-to programs for managing BAC files. If you want the most recent release of REALbasic, head over to the REAL Software site and download the version designed to run on all platforms.

After completing the installation, BAC files should be recognized by the system and linked to REALbasic.

Set REALbasic as your default BAC viewer

Set default app to open files on Mac

Right-click or Control + left-click on the desired BAC 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 REALbasic. 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 BAC 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 REALbasic 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 BAC files.

Solving Common BAC File Challenges

While BAC 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 REALbasic to Crash Frequently?

Insufficient software updates are a likely cause of REALbasic crashes. Be sure to install the latest updates for REAL Software 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 BAC file?

Start a data recovery program and open the damaged BAC file. Then, choose the "Repair" option from the menu. Allow the recovery process to complete, which will automatically repair the damaged data files.

How can I determine if my BAC file is damaged?

Characteristics of corrupted BAC data files can include:

REALbasic 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 BAC file size inflation;
Editing the archive in REALbasic is hampered by poor overall performance;

How to edit a BAC file?

To modify BAC files, you need to install special software that makes it possible to open and edit data files. Online BAC editors are more restricted compared to software designed for Backup Format.

Best BAC Editor Software in 2026

Taking the above factors into account, we have selected a list of BAC editors currently available.

BAC Editor Software	Developer	Platforms	Overall Rating
PowerBASIC	PowerBASIC	Windows	4.7 out of 5 (37 reviews)
REALbasic	REAL Software	Windows, Mac OS, Linux	4.5 out of 5 (40 reviews)

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