Unable to register 7zip to open zip files

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  1. Posts : 468
    Windows 10 Pro version 21H2
       #1

    Unable to register 7zip to open zip files


    Windows 10 Pro 1803 will not register the 7zip app to open .zip files.
    When it displays the app selection, 7zip is not even listed. It directs me to select the program from C:\Program Files which works but does not retain the selection permanently.

    sfc /scannow and chkdsk c:/f/v both report everything is OK.

    It is not listed in the context menu, where it existed in the past.
    It won't register it through the file properties type selection.
    Not in "Open with".
    I searched the registry, and the extension .zip exists but it does not have an "open with" value.
    How can I correct this?
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  2. Posts : 56,050
    Multi-boot Windows 10/11 - RTM, RP, Beta, and Insider
       #2

    ineuw said:
    Windows 10 Pro 1803 will not register the 7zip app to open .zip files.
    When it displays the app selection, 7zip is not even listed. It directs me to select the program from C:\Program Files which works but does not retain the selection permanently.

    sfc /scannow and chkdsk c:/f/v both report everything is OK.

    It is not listed in the context menu, where it existed in the past.
    It won't register it through the file properties type selection.
    Not in "Open with".
    I searched the registry, and the extension .zip exists but it does not have an "open with" value.
    How can I correct this?
    Did this just suddenly happen? You may want to uninstall it and re-install the x64 version. Working fine here.

    https://www.7-zip.org/
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  3. Posts : 34,915
    Win 10 Pro (1903) (2nd PC is 21H2)
       #3

    Some people are having problems with file type associations with build 1803. This has been linked to update KB4462919. At least one person has fixed the issue by removing the update.


    And some have found this is related to having a certain program installed.
    Version 1803 does not allow me to set defaults by app - MoBEX error Solved - Windows 10 Forums

    There are various threads on this on the forum - it's a reported bug.
    E.g.
    cannot change file association - Windows 10 Forums
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  4. Posts : 5,081
    21H1 64 Bit Home
       #4
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  5. Posts : 468
    Windows 10 Pro version 21H2
    Thread Starter
       #5

    f14tomcat, dalchina, Callender, Thank you all for the info. Now I must go and read them.

    P.S: f14tomcat, I have the correct version
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  6. Posts : 56,050
    Multi-boot Windows 10/11 - RTM, RP, Beta, and Insider
       #6

    ineuw said:
    f14tomcat, dalchina, Callender, Thank you all for the info. Now I must go and read them.

    P.S: f14tomcat, I have the correct version
    Ponder away! Let us know.......
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  7. Posts : 468
    Windows 10 Pro version 21H2
    Thread Starter
       #7

    Well, a number of things happened.

    1. Removed, rebooted and reinstalled 7zip.
    2. In 7zip options I selected the preferred extensions to be recognized.
    3. Windows registered these changes and recognized the file. The file properties correctly shows the file type, and so is the 'Open with'. But, it failed to add 7zip access in the context menu, without which one cannot zip a file.
    4. So I uninstalled KB4462919, rebooted and re-installed 7zip and that didn't help either.
    5. Then, Windows update complained about the uninstalled missing security update, and proceeded to reinstalled it along with some other updates.


    So now I can unzip, but zipping a file is a complicated process.
    P.S: I forgot to mention that uninstalling the security update also knocked out the browsers. Could not connect with either Cyberfox or Vivaldi.



    Last edited by ineuw; 24 Oct 2018 at 21:46. Reason: adding info
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  8. Posts : 34,915
    Win 10 Pro (1903) (2nd PC is 21H2)
       #8

    In 7zip options I selected the preferred extensions to be recognized.
    - you shouldn't be able to do that from within a program. From Win 8 on, associations have had to be managed by Windows.

    But, it failed to add 7zip access in the context menu,
    + browser issues

    Tends to suggest you might have other problems, MS bugs aside, not just dealing with zip and associations.

    The update would be offered again unless you hid it- and a couple of people did hide it (they said) and it was still installed!!

    Suggest you run some basic checks- e.g.
    From an admin command or powershell prompt
    SFC /SCANNOW
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  9. Posts : 468
    Windows 10 Pro version 21H2
    Thread Starter
       #9

    dalchina said:
    - Suggest you run some basic checks- e.g.
    From an admin command or powershell prompt
    SFC /SCANNOW
    Both sfc /scannow and chkdsk c:/f/v indicate that all is OK. But it's a lot easier to restore the last Macrium mirror from 2 days ago and save a lot of time. Then, let's see what the updates do.
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  10. Posts : 5,081
    21H1 64 Bit Home
       #10

    To add options to context menu run 7zFM.exe > Tools> Options

    Unable to register 7zip to open zip files-7zip.jpg
    Last edited by Callender; 25 Oct 2018 at 15:19. Reason: correction to file name
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