The File Extensions Database


.MP4B File Extension

  • Developer by: Apple, Inc.
  • Category: Audio and sound Files

What is an .MP4B file?

.MP4B is MPEG-4 Audio Layer bookmarkable data

The mp4b file format is similar to files using m4a file extension.

The difference is however, that the mp4b files can be bookmarked and thus are mostly used for audio books, podcasts and any other audio work.

The default file extension for MPEG-4 Audio Layer bookmarkable file is m4b.


How to open:

Use QuickTime to work with *.mp4b bookmarkable data.

How to convert:

Use compatible tools to export mp4b files to other formats.

How to solve problems with MP4B files

  • Associate the MP4B file extension with the correct application. On :
    Windows: Right click on any MP4B file and then click "Open with" > "Choose another app". Now select another program and check the box "Always use this app to open *.MP4B files". Mac: Right click (or Ctrl-click) the MP4B file, then click "Open with" > "Other...". Then choose another program and check the "Always Open With" box. Linux: Right click on the file, and select "Open with" and choose another program. iPhone: Tap the file. If you do not see an app to open the file, then tap Share "Share" and choose an app. Alternatively, save the file. Then open the Files app Files app. There long-press on the file, then release your finger. You will see a black menu bar. Then tap "Share" and select an app. Android: Tap the Settings icon on your smartphone, then tap on the Apps section. There tap the Options icon in the top right-hand corner of the screen to change the default apps.
  • Update your software that should actually open .MP4B is MPEG-4 Audio Layer bookmarkable data. Because only the current version supports the latest MP4B file format. Search, therefore, e.g. on the Apple, Inc. manufacturer website after an available .MP4B is MPEG-4 Audio Layer bookmarkable data update.
  • To make sure that your MP4B file is not corrupted or virus-infected, get the file again and scan it with antivirus software.