Set Microsoft Edge as Default Browser One Time

The New Microsoft Edge browser is great and everyone should use it :) Especially if you’re still on Internet Explorer, you can make Edge use IE mode for the sites you have that still require IE, without having to actually use IE.

I had a scenario where I wanted Internet Explorer users to be changed to Microsoft Edge. Previously, we’d had business requirements to set IE as the default – but now that’s no longer required, I wanted to flip their default. At the same time, I didn’t want to change Google Chrome default browser users as they’d already made that choice, and didn’t want to shove a similar Chromium browser down their throats.

As per Microsoft’s doco https://docs.microsoft.com/en-us/deployedge/edge-default-browser you can use an XML file with default associations, and use Group Policy to point to that XML. It doesn’t stop users from changing the associations, but it does reset the associations each time the user logs in – so not ideal if you want to set a default, but also allow flexibility.

I worked out how to do this based on current default browser and using GPO still, so here’s what I did:

As per the doco above, create an XML file that sets Microsoft Edge as the default application for certain protocols:

<?xml version="1.0" encoding="UTF-8"?>
<DefaultAssociations> 
  <Association ApplicationName="Microsoft Edge" ProgId="MSEdgeHTM" Identifier=".html"/>
  <Association ApplicationName="Microsoft Edge" ProgId="MSEdgeHTM" Identifier=".htm"/>
  <Association ApplicationName="Microsoft Edge" ProgId="MSEdgeHTM" Identifier="http"/>
  <Association ApplicationName="Microsoft Edge" ProgId="MSEdgeHTM" Identifier="https"/>  
  <Association ApplicationName="Microsoft Edge" ProgId="MSEdgePDF" Identifier=".pdf"/>
</DefaultAssociations>

Note that .PDF is included, so if you’d rather not default .PDF files to Microsoft Edge, remove that line from the code.

The Group Policy in the doco to set this XML is called Set a default associations configuration file – and all it’s doing is populating a registry key. Instead of using the Group Policy setting, create a registry setting to apply a value to:

Computer\HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows\System
DefaultAssociationsConfiguration - REG_SZ - Path to XML e.g. \\dfs\share\defaultapplication.xml

The Group Policy registry setting will look like this:

We only want this registry setting to apply when the default browser is IE, and not apply any other time. We can use two options to do this – Remove this item when it is no longer applied, and Item-level targeting:

“Remove this item when it is no longer applied” will remove the registry setting when the item-level targeting condition is no longer true, which will stop the default browser applying again and again once the default browser isn’t IE.

“Item-level Targeting” is where we’ll check another registry value to see if IE is the default browser.

This is checking the registry key path Computer\HKEY_CURRENT_USER\Software\Microsoft\Windows\Shell\Associations\UrlAssociations\http\UserChoice

and the Value name ProgId

and the Value Data IE.HTTP

Only when all this is true, will the XML reg key apply. Next time someone logs on, the default program associations file will be read and apply the new browser default. Then, next time Group Policy evaluates, the registry setting will be out of scope and removed, so the default program assocations file registry setting will be removed.

For reference, Chrome will be the value ChromeHTML and Edge will be MSEdgeHTM.

This method worked quite well and gave me what I was after – a one time change from Internet Explorer to Microsoft Edge, without bothering Chrome and Firefox users.

Note that this will also keep kicking in if the user changes their browser default back to Internet Explorer, which might be what you want – but if not, you’d need to add another Item-level target using a flag file or registry setting to mark that the default browser has already been applied once.

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