Copilot Opens in Browser Instead of Office App: How to Fix

You click the Copilot button in Word, Excel, or PowerPoint, but instead of opening the side pane inside the app, your default browser launches a new tab pointing to copilot.microsoft.com. This behavior disrupts your workflow because you lose inline context, cannot drag responses into your document, and must switch between windows constantly. The issue occurs when the Microsoft 365 app or your operating system misroutes the Copilot activation link to the web version instead of the native desktop component. This article explains the exact registry, policy, and app settings that cause the browser redirect and provides step-by-step fixes to force Copilot to stay inside the Office app.

Why Copilot Redirects to the Browser Instead of the Office App

Copilot in Microsoft 365 apps uses a protocol link with the scheme microsoft-edge:// to launch its side pane. When you click the Copilot icon, the Office app sends a request to Windows to open this link. If Windows does not have a correct file type association for the microsoft-edge protocol, or if a third-party browser like Chrome, Firefox, or Brave has claimed the https:// fallback, the link opens in the default browser instead of the embedded Edge WebView2 control inside the Office app.

The root cause is almost always one of three scenarios:

• Broken protocol association: The registry entry for microsoft-edge is missing or points to a different executable.
• Default browser override: A browser other than Microsoft Edge has been set as the system default, and that browser intercepts the https redirect that Copilot uses as a fallback.
• Group Policy or MDM conflict: An IT administrator has pushed a policy that disables Copilot in the Office app or redirects all Copilot traffic to the web.

Steps to Force Copilot to Open Inside the Office App

Follow these methods in order. Test after each method by restarting the Office app and clicking the Copilot icon.

Method 1: Reset the microsoft-edge Protocol Association

1. Open Windows Settings
   Press Windows key + I to open Settings. Go to Apps > Default apps.
2. Search for the protocol
   In the search box under “Set defaults for applications,” type microsoft-edge. If no results appear, skip to Method 2.
3. Select the current handler
   Click the result that says “microsoft-edge” or “Microsoft Edge.” A dialog shows which app currently handles this protocol. It should say Microsoft Edge. If it says anything else, click the app name and choose Microsoft Edge from the list.
4. Restart the Office app
   Close Word, Excel, or PowerPoint completely. Reopen the app and click the Copilot button. The pane should now appear inside the app.

Method 2: Repair the Registry Key Manually

If the protocol association appears correct but Copilot still opens in the browser, the registry key itself may be corrupt.

1. Open Registry Editor
   Press Windows key + R, type regedit, and press Enter. Click Yes if prompted by User Account Control.
2. Navigate to the microsoft-edge key
   Go to HKEY_CURRENT_USER\Software\Classes\microsoft-edge. If the key does not exist, create it: right-click Classes, select New > Key, and name it microsoft-edge.
3. Set the default value
   With the microsoft-edge key selected, double-click the (Default) value in the right pane. Set its data to URL:microsoft-edge. Click OK.
4. Add the URL Protocol value
   Right-click an empty area in the right pane, select New > String Value. Name it URL Protocol. Double-click it and set its data to an empty string (leave it blank). Click OK.
5. Create the DefaultIcon subkey
   Right-click the microsoft-edge key, select New > Key, and name it DefaultIcon. Double-click the (Default) value in the right pane and set its data to C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe. Click OK.
6. Create the shell subkey structure
   Right-click the microsoft-edge key, select New > Key, and name it shell. Under shell, create a key named open. Under open, create a key named command. Double-click the (Default) value under command and set its data to "C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe" --single-argument %1. Click OK.
7. Restart the Office app
   Close all Office apps and reopen one. Click Copilot to verify it opens inside the app.

Method 3: Set Microsoft Edge as the Default Browser

1. Open Windows Settings
   Press Windows key + I and go to Apps > Default apps.
2. Set Edge as default
   Under “Set a default for each file type or link type,” scroll to the bottom. Click “Choose defaults by link type.” Find HTTP and HTTPS and set each to Microsoft Edge. If a different browser is set, click the browser name and select Microsoft Edge.
3. Restart your computer
   A full restart ensures all protocol handlers refresh. After restarting, open an Office app and test Copilot.

Method 4: Check Group Policy or MDM Settings

If you are on a work or school device, an administrator may have configured a policy that forces Copilot to open in the browser. Verify these settings:

1. Open Local Group Policy Editor
   Press Windows key + R, type gpedit.msc, and press Enter. If this tool is not available, your device is managed by Microsoft Intune or a similar MDM service. Contact your IT administrator.
2. Navigate to Edge Copilot policy
   Go to Computer Configuration > Administrative Templates > Microsoft Edge. Look for a setting named “Configure Copilot.” Double-click it.
3. Set to Enabled with correct mode
   If the policy is Enabled, check the dropdown. Select “Enable Copilot in Microsoft Edge and allow it to open in the Office app” or a similar option that mentions the Office app. Click OK.
4. Restart the Office app
   Close and reopen the Office app. Click Copilot to confirm it opens in the side pane.

If Copilot Still Opens in the Browser After the Main Fix

Copilot opens in Chrome or Firefox despite Edge being default

Some third-party browsers register themselves as handlers for the microsoft-edge protocol during installation. Open Chrome and go to Settings > Default browser. Turn off “Register as default browser for microsoft-edge links” if the option exists. In Firefox, go to Settings > General > Applications. Search for microsoft-edge and change the action to “Always ask” or “Use Microsoft Edge (default).”

Copilot button is grayed out or missing after the fix

The Copilot button may disappear if the Microsoft 365 app is not signed into a work or school account with a Copilot license. Go to File > Account and verify that the license shows “Microsoft 365 Copilot” under Subscriptions. If the license is missing, contact your IT administrator or sign in with the correct account.

Copilot opens in a separate Edge window instead of the side pane

This indicates that the Office app is launching an external Edge process rather than using the embedded WebView2. Run the Microsoft Edge WebView2 Runtime installer from the official Microsoft website. After installation, restart the Office app. The side pane should appear inside the app window.

Copilot Opens in Browser vs Copilot Opens in Office App: Key Differences

Item	Opens in Browser	Opens in Office App
Context awareness	No access to the current document or file	Can read and summarize the active document
Drag-and-drop support	Not available	Drag responses directly into the document
Authentication method	Requires separate browser sign-in	Uses the Office app’s existing session
Performance	Slower due to browser tab overhead	Faster with embedded WebView2 rendering
Feature parity	Full web Copilot with all plugins	Limited to Office-specific commands

You can now force Copilot to open inside Word, Excel, or PowerPoint by fixing the protocol association, resetting the default browser, or adjusting group policy. Start with the registry repair in Method 2 if the Settings app does not show the microsoft-edge protocol. After the fix, test Copilot in a new document to confirm the side pane appears. For persistent issues, run the Microsoft Edge WebView2 Runtime installer to ensure the embedded component is up to date.