cannot change file association

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  1. Posts : 7,606
    Windows 10 Home 20H2

    C:\Windows\system32>assoc .flv
    File association not found for extension .flv
    C:\Windows\system32>assoc .avi
    C:\Windows\system32>ftype WMP11.AssocFile.AVI 
    WMP11.AssocFile.AVI="%ProgramFiles(x86)%\Windows Media Player\wmplayer.exe" /prefetch:8 /Open "%L"
    What commands should be run in order to change the default app for both ".flv" and ".avi" to the following app?
    "D:\The KMPlayer\KMPlayerPortable.exe"
      My Computer

  2. Posts : 71
    Windows 10
    Thread Starter

    @Matthew Wai, it says "File association not found for extension .flv".

    You have to create a handle for .flv first :

    assoc .flv=flv123
    ftype flv123="D:\The KMPlayer\KMPlayerPortable.exe" "%1"
      My Computer

  3. Posts : 42,870
    Win 10 Pro (22H2) (2nd PC is 22H2)

    You might like to consider this:
    cannot change file association-1.jpg

    cannot change file association-2.png
      My Computers

  4. Posts : 71
    Windows 10
    Thread Starter

    also run as administrator
      My Computer

  5. Posts : 71
    Windows 10
    Thread Starter

    to change file icon :

    Example, for a Python .py file :

    In registry :

    Set that to empty.

    This will take the default icon of the program you made the association. Notepad2 in my case.
      My Computer

  6. Posts : 7,606
    Windows 10 Home 20H2

    I found that the following commands work for both an existent extension and a nonexistent one.

    assoc .abc=(abc)
    ftype (abc)="C:\anyfolder\anyprogram.exe" "%1"
      My Computer

  7. Posts : 1
    Windows 10

    Did anyone try KB4462933 (OS Build 17134.376) to see if it happens to fix the issue?
      My Computer

  8. Posts : 396
    Windows 10 Pro 64-Bit

    from what I can see in the news folder for that CU update, a few people are STILL having that file association issue even after installing it; so I guess Microsoft didn't fix it yet
      My Computer

  9. Posts : 396
    Windows 10 Pro 64-Bit

    yesterday, I took a fresh downloaded win10 iso, did a fresh install onto a spare laptop (debug purposes), and downloaded and installed the latest 1803 cumulative update and minor updates (flash update, malicious software removal tool, etc..)

    I refute the claims that nothing is wrong with kb4462933, as even on a fresh install, I still couldn't change file associations, even when assigning 7zip to open .7z files through the file's property window and not 7zip's internal association menu
      My Computer

  10. Posts : 42,870
    Win 10 Pro (22H2) (2nd PC is 22H2)

    Have you reported it via the Feedback Hub? Would be useful to have a link to up vote.
      My Computers


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