The File Extensions Database


.M4U File Extension

  • Category: Video Files
  • Format: Text

What is an .M4U file?

.M4U is MPEG-4 Playlist

Playlist used by some video player programs; contains links to MPEG-4 movies and video clips, but does not contain the video files themselves; similar to an .M3U file, which stores a playlist for .MP3 files.

How to solve problems with M4U files

  • Associate the M4U file extension with the correct application. On :
    Windows: Right click on any M4U file and then click "Open with" > "Choose another app". Now select another program and check the box "Always use this app to open *.M4U files". Mac: Right click (or Ctrl-click) the M4U 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 .M4U is MPEG-4 Playlist. Because only the current version supports the latest M4U file format. Search, therefore, e.g. on the N/A manufacturer website after an available .M4U is MPEG-4 Playlist update.
  • To make sure that your M4U file is not corrupted or virus-infected, get the file again and scan it with antivirus software.