Windows10 1909 Upgrade - An App Default Was Reset

Ben Kosar 26 Reputation points
2020-04-02T13:01:20.147+00:00

My org is using WIn10 Pro (volume license) build 1809. We want to upgrade to 1909. We use PDQ Deploy to download the install.wim and run this command to install:
start /wait c:\UpgradeInstall\1903\setup.exe /auto upgrade /Compat IgnoreWarning /installfrom c:\UpgradeInstall\1903\sources\install.wim /dynamicupdate enable /showoobe none /quiet

As a background we use a default associations configuration file (we've named to win10-default-associations.xml) which is applied via GPO.

After the windows upgrade when a user logs in they are assaulted with a flurry of about 15-30-ish messages that a app default was reset. And the default apps are all reset generally to MS products, PDF's are switched from adobe to edge, etc. There have been a number of exports done with DISM and in all manner of testing the upgrade to either 1903 or 1909. This is holding up my beta testing of 1909. Does anyone have any info or a solution?

I've been following this thread, in which by word of mouth supposedly there is supposed to be a fix of some kind in this month's patch tuesday.
https://social.technet.microsoft.com/Forums/en-US/ad37cd15-315e-4f9b-ba34-bcbd987981fc/quotan-app-default-was-resetquot-error-newly-sysprep-windows-10-ltsc-2019-enterprise-image?forum=win10itprosetup

Does anyone happen to have any inside info, more specifics, or anything at all? If there is a hotfix, patch, etc, would love to get my hands on it, or at least know what it is so I can open a case with MS and request it.

Windows 10 Setup
Windows 10 Setup
Windows 10: A Microsoft operating system that runs on personal computers and tablets.Setup: The procedures involved in preparing a software program or application to operate within a computer or mobile device.
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Accepted answer
  1. Joy qiao 876 Reputation points
    2020-04-03T03:10:54.437+00:00

    Hi,
    I noticed you are using PDQ deploy which is not supported by Microsoft. I would recommend to use Sysprep to check the issue again.
    As we have encounter same issue with your referred thread, I would provide my knowledge here for you and other similar issue customers' reference.

    When using copyprofile true, the current user's profile gets copied over to the c:\users\default and is used as the default template for a new user creation by windows
    For this default user account the following entries already exist
    HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\FileExts\<fileextensions>\userChoice\Hash
    However the hash is based off the SID of the user account in whose context the sysprep was run
    So now when a new user logs on OEMDefaultAssociations.xml gets applied, the Hash that is already present is detected as invalid causing a application notification storm of app resets.

    Based on discussion with feature team for FileExts, Sysprep copyprofile in unattend.xml is not fully supported for this scenario. Incase copyprofile option still needs to be used, then the end user/Deployment admin, needs to ensure before the copyprofile runs, to copy the target profile as the default profile,

    The source profile really should not have anything in either of these locations either:

    HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\FileExts
    HKEY_CURRENT_USER\Software\Microsoft\Windows\Shell\Associations\UrlAssociations
    Also delete the entry
    FileAssociationsUpdateVersion
    from HKEY_CURRENT_USER\Software\Microsoft\Windows\Shell\Associations

    The above steps will ensure that the default profile is not seeded with the old user's file extension choices. and regular user defaults get applied as per OEMDefaultAssociations.xml

    Please feedback your action result here.

    Bests,


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  1. IT Buchs 1 Reputation point
    2020-05-04T06:31:07.863+00:00

    Just noticed that with the patch installed if you logon with a user profile for the first time the reset messages again appear... windows 10 1909 18363.815

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  2. romanelo 1 Reputation point
    2020-04-30T19:38:30+00:00

    Tested on 1909, can confirm KB4550945 resolves this issue, I can't believe it took 1 year to fix this.

    0 comments No comments

  3. jaybird283 561 Reputation points
    2020-04-23T22:22:40.727+00:00

    Did you just inject that update into your 1909 upgrade media?

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  4. IT Buchs 1 Reputation point
    2020-04-22T07:12:46.133+00:00

    This update seems to fix the issue. Tested it today... No more strange App Default Reset messages
    https://support.microsoft.com/en-us/help/4550945