M4B File Extension

What is M4B file?

The files that have .M4B extension is mainly utilized to save audio books that have been downloaded from the Apple’s iTunes store. The .M4B file format is copy protected by using the "FairPlay" DRM technology by Apple."

With this technology, Apple prevents a user from executing the audio books on illegal and unofficial devices and systems. A user, however, be authorized to use the content for up to 5 systems on just one iTunes account to play the file. If the user wants to play the file on more than 5 devices, then they are required to create one more account and then purchase the file to use it on other systems.

Programs which support M4B file extension

Below you will find an index of software programs that can be used to open M4B files divided into 4 categories according to system platform supported. Files with M4B extension, just like any other file formats, can be found on any operating system. The files in question may be transferred to other devices, be it mobile or stationary, yet not all systems may be capable of properly handling such files.

Updated: 10/30/2022

How to open file with M4B extension?

There can be multiple causes why you have problems with opening M4B files on given system. On the bright side, the most encountered issues pertaining to MPEG-4 Audio Book Format files aren’t complex. In most cases they can be addressed swiftly and effectively without assistance from a specialist. We have prepared a listing of which will help you resolve your problems with M4B files.

Step 1. Download and install iTunes

The most common reason for such problems is the lack of proper applications that supports M4B files installed on the system. The most obvious solution is to download and install iTunes or one to the listed programs: Winamp, VLC media player, Windows Media Player. The full list of programs grouped by operating systems can be found above. One of the most risk-free method of downloading software is using links provided by official distributors. Visit iTunes website and download the installer.

Step 2. Check the version of iTunes and update if needed

If you already have iTunes installed on your systems and M4B files are still not opened properly, check if you have the latest version of the software. Software developers may implement support for more modern file formats in updated versions of their products. The reason that iTunes cannot handle files with M4B may be that the software is outdated. All of the file formats that were handled just fine by the previous versions of given program should be also possible to open using iTunes.

Step 3. Associate MPEG-4 Audio Book Format files with iTunes

After installing iTunes (the most recent version) make sure that it is set as the default application to open M4B files. The next step should pose no problems. The procedure is straightforward and largely system-independent

Change the default application in Windows

• Right-click the M4B file and choose Open with option
• Click Choose another app and then select More apps option
• To finalize the process, select Look for another app on this PC entry and using the file explorer select the iTunes installation folder. Confirm by checking Always use this app to open M4B files box and clicking OK button.

Change the default application in Mac OS

• By clicking right mouse button on the selected M4B file open the file menu and choose Information
• Proceed to the Open with section. If its closed, click the title to access available options
• Select the appropriate software and save your settings by clicking Change all
• A message window should appear informing that This change will be applied to all files with M4B extension. By clicking Continue you confirm your selection.

Step 4. Check the M4B for errors

Should the problem still occur after following steps 1-3, check if the M4B file is valid. Problems with opening the file may arise due to various reasons.

1. The M4B may be infected with malware – make sure to scan it with an antivirus tool.

Should it happed that the M4B is infected with a virus, this may be that cause that prevents you from accessing it. Immediately scan the file using an antivirus tool or scan the whole system to ensure the whole system is safe. M4B file is infected with malware? Follow the steps suggested by your antivirus software.

2. Check whether the file is corrupted or damaged

Did you receive the M4B file in question from a different person? Ask him/her to send it one more time. It is possible that the file has not been properly copied to a data storage and is incomplete and therefore cannot be opened. When downloading the file with M4B extension from the internet an error may occurred resulting in incomplete file. Try downloading the file again.

3. Verify whether your account has administrative rights

Sometimes in order to access files user need to have administrative privileges. Switch to an account that has required privileges and try opening the MPEG-4 Audio Book Format file again.

4. Verify that your device fulfills the requirements to be able to open iTunes

If the system is under havy load, it may not be able to handle the program that you use to open files with M4B extension. In this case close the other applications.

5. Verify that your operating system and drivers are up to date

Regularly updated system, drivers, and programs keep your computer secure. This may also prevent problems with MPEG-4 Audio Book Format files. Outdated drivers or software may have caused the inability to use a peripheral device needed to handle M4B files.

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