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1Fix the driver behind crashes, sound loss and screen glitches2Repair Windows errors before they cause bigger problems3Scan for outdated or missing drivers - takes under a minuteOn organization-managed Windows PCs, administrators can use the Set a default associations configuration file policy to apply chosen file and link handlers at sign-in. It is not a universal consumer fix: the policy is device-scoped, and it does not establish why any particular PC keeps changing defaults.
What the policy changes—and who it is for
The policy applies a centrally prepared XML file of file-type and protocol associations when a user signs in. Microsoft documents it for Windows 10 version 1703 and later, and lists Pro, Enterprise, Education, and IoT Enterprise editions; its applicability table does not list Home. See Microsoft’s ApplicationDefaults Policy CSP.
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This is an administrator control for managed devices, not a setting an individual user should expect to find in the normal Default apps screen. It can help an organization make selected defaults consistent, but it cannot by itself diagnose a reset or guarantee that every app choice will remain unchanged in every situation.
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Scan for outdated or missing drivers - takes under a minuteDriver Scan →Repair Windows errors before they cause bigger problemsFix Now →Fix the driver behind crashes, sound loss and screen glitchesFind Drivers →How an administrator configures it
- Prepare a reference PC. Install the intended applications, then choose the desired defaults in Windows Settings. Microsoft cautions that app registrations may be delayed on a new reference machine, so check that the required handlers are present before exporting.
- Export the associations. Open Command Prompt as an administrator and run
Dism /Online /Export-DefaultAppAssociations:C:appassoc.xml. Microsoft also provides this example using a drive path:Dism /Online /Export-DefaultAppAssociations:"F:AppAssociations.xml". The export reflects associations from the configured installation; review it rather than assuming it is a complete, evergreen policy file. See Microsoft’s Export or Import Default Application Associations. - Maintain one XML file. Review the entries for the Windows versions and registered handlers in your environment. Imports are not cumulative: Microsoft says the last imported file is the one handled. Combine needed entries into one file and remove duplicates rather than expecting separate XML imports to merge.
- Deploy the policy through the device’s management authority. In Group Policy, open Computer Configuration > Windows Components > File Explorer, then configure Set a default associations configuration file with the XML file location. For MDM, Microsoft documents the policy node
./Device/Vendor/MSFT/Policy/Config/ApplicationDefaults/DefaultAssociationsConfiguration; the association file is base64 encoded for SyncML. - Choose how often associations should reapply. Set the XML version and per-association behavior deliberately, as described below. Test the resulting sign-in behavior before broad deployment.
- Refresh the file as the environment changes. Revisit it after major Windows upgrades or application changes. Missing associations can lead to “An app default was reset” notifications, and upgrades can reassign some handlers.
When defaults reapply: Version and Suggested
Microsoft documents special XML behavior starting with Windows 11 version 22H2. For that version and later, an association marked Suggested="true" is applied once for the current DefaultAssociations Version. An association with Suggested="false", or without the attribute, is applied at every sign-in. Increasing the XML’s version causes suggested associations to be applied again at a later sign-in.
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That distinction lets administrators choose whether to keep reasserting an association at sign-in or apply it once for a given policy version. It does not make every choice permanently immutable: suggested associations can be applied again when the version changes, while the policy’s other associations are reapplied at sign-in. Use the behavior that matches the organization’s need to preserve user changes versus maintain a managed default.
Group Policy and MDM precedence
If both management channels configure this setting, Microsoft states that MDM takes precedence over Group Policy for this policy, even when MDMWinsOverGP is not configured. Check which management authority is delivering the effective XML before troubleshooting conflicting settings.
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What an individual user can do on an unmanaged PC
Use Settings > Apps > Default apps to choose defaults by application, file type, or link type. The exact controls depend on the association you want to change. Microsoft’s platform guidance says default-app choices must be made through system UI with user interaction; changing app defaults by directly editing the registry is unsupported. See Windows app integration: Default applications and Microsoft’s Change default apps in Windows.
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Why one PC’s resets may have a different cause
The policy is one managed-device mechanism, not proof that it caused—or will resolve—a particular user’s resets. Microsoft documents several maintenance-related caveats: an XML file may omit associations, a reference machine may not yet have all app registrations, imports do not merge, and a Windows upgrade may reassign some handlers. Those possibilities make it important to inspect the actual device’s management configuration and the XML rather than assume a single cause.
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Apps can register the file types and protocols they support, but registration is separate from a user’s selected default. Windows protects default choices from silent changes; for an unmanaged machine, use Settings rather than registry edits or an unverified policy workaround.
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