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If you want to troubleshoot this, keep calm and run Procmon You can check the Microsoft-Windows-Shell-Core/AppDefaults event log for clues about file associations reset. Stop using script or other pre-Windows 10 ways for configuring file association. If a program is trying to set some registry keys, Explorer will detect it and the file association will be reset. Why I'm getting an app reset notification? OEMDefaultAssociations.xml contains the following lines:
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The main XML, CustomDefaultAssoc.xml must contain all extensions. You just need to have two XML files, one for configuring the defaults and another one to force file association.
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As previously seen, removing entries in XML file could result in app reset notifications.īut don't panic, there is a solution to do it in your Windows 10 reference image.

So, they removed everything in the XML file except Internet Explorer entries. For example, they want to configure Internet Explorer as default for HTTP/HTTPS only for HR people. Some IT Pros want to force only some file associations and let users in control for others file associations.
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How to force only a set of file associations? But at each logon the default association configured in XML file will be applied. Note: this policy will not prevent user to change the file association. If this group policy is enabled and the client machine is domain-joined, the file will be processed, and default associations will be applied at logon time. Your file will be copied in \Windows\System32 with the following name OEMDefaultAssociations.xml Configure the XML file for your domain-joined computerĬonfigure the following policy Set a default associations configuration file located in Computer\Policies\Administrative Templates\Windows Components\File Explorer.

This policy works only for domain-joined computer.Ĭonfigure the XML file for your Windows 10 reference image:ĭism.exe /online /import-defaultappassociations:c:\temp\CustomFileAssoc.xml User will be able to change file association, but at the next logon file association will be configured using XML file.

If you're using an XML file from Windows 10 1607, epub is missing. For example, in Windows 10 1703, Microsoft Edge registers the epub extension. Let's try to configure Internet Explorer as the default browserĪs some recommended applications can manage more extensions with each new Windows 10 version available, it's a good practice to refresh your XML. In Windows 10 1709, this control panel item is now in Settings app. Go to Control Panel\All Control Panel Items\Default Programs and configure default apps associations.
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The best way to do it is to set up a reference computer, install applications, configure default programs and use Dism to export/import the custom default app associations or use a group policy.
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It's possible for IT Pro to configure or force default association using supported methods. How to configure file association in Windows 10? These change is documented in KB4001770: Reset app default when a registry setting is deleted or corrupted and streamlined notification about the corruption. Additionally, the end-user will receive this notification: An App default was reset. Now,Windows 10 detects that the registry is corrupted and will reset the default program for this file extension. You will find some explanation on The Old New Thing blog: Why do my PDF file associations get reset every time I restart? Windows 10: An app default was resetīut what happens if an application is not using Windows API and writes some stuff and hijacks user preferences? For more information about these changes.
