Playing MP4 gives "Package could not be registered" Solved

  1.    #1

    Playing MP4 gives "Package could not be registered"

    I get the above error when I try to open a MP4 video file. It plays ok with VLC Player. I cannot set the default video player - it shows "Films and TV". If I try to click on VLC, it does not do anything.

    Do I need to "Repair" the Windows 10? If so, what is the best way please?
      My ComputerSystem Spec

  2. Bree's Avatar
    Posts : 10,789
    10 Home x64 (1809) (10 Pro on 2nd pc)

    Welcome to TenForums @devdeep60

    The 'Package could not be registered' error may be fixed by reinstalling and re-registering 'Films & TV'. See this tutorial.

    Reinstall and Re-register Apps in Windows 10 | Tutorials

    Note that it calls it 'Movies & TV' in the tutorial. Don't worry, it's the same thing. It's called 'Films &TV' in a UK install of Windows 10.

    What version does Winver say you have? There were known problems in both 1803 and 1809 in setting default apps, but those were fixed in recent cumulative updates. For 1809 it was fixed in build 17763.168 and for 1803 in build 17134.441.

    Microsoft said:
    Addresses an issue that prevents some users from setting Win32 program defaults for certain app and file type combinations using the Open with command or Settings > Apps > Default apps.
    Cumulative Update KB4469342 Windows 10 v1809 Build 17763.168 - Dec. 5 Windows Update - Windows 10 Forums
    Cumulative Update KB4467682 Windows 10 v1803 Build 17134.441 - Nov. 27 Windows Update - Windows 10 Forums

    If you are on a lower build number then make sure you are up to date by clicking 'Check for updates' in Settings > Update & Security > Windows update. Note that doing so in 1803 may well also get you the 'Features update to Windows 10, version 1809'. If you'd prefer to stay on 1803, then download and install the standalone package for the latest cumulative update from the Update Catalog, links can be found in this post:

    Cumulative Update KB4487029 Windows 10 v1803 Build 17134.619 - Feb. 19 Windows Update - Windows 10 Forums.
    Last edited by Bree; 04 Mar 2019 at 09:00.
      My ComputersSystem Spec

  3.    #3

    Thanks a lot!! This has worked a treat!
      My ComputerSystem Spec

  4. Bree's Avatar
    Posts : 10,789
    10 Home x64 (1809) (10 Pro on 2nd pc)

    devdeep60 said: View Post
    Thanks a lot!! This has worked a treat!

    Great! Which fix did it for you, was it re-registering Films & TV?
      My ComputersSystem Spec

  5.    #5

    Reregistering the apps did the trick
      My ComputerSystem Spec

  6. Bree's Avatar
    Posts : 10,789
    10 Home x64 (1809) (10 Pro on 2nd pc)

    Thanks @devdeep60. For the benefit of others looking for a solution, you can click the 'Mark as Solved' button that you should find at the bottom of this thread.

    Click image for larger version. 

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      My ComputersSystem Spec


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