I've encountered an annoying issue where any links in Microsoft Office 2010 applications (Word, Excel, Outlook) installed on Windows 10 always open links in Microsoft Edge. This is despite having set Firefox or Chrome (I tested both) as the default browser.

HTML files and links from other applications open in the default browser as expected. MS Office just says nope and forces links to open in Edge.

How can I get them to use my selected default browser?

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    Fun fact: even in older versions of Windows, Office applications would first use some built-in IE component to request the URL (Microsoft Office Protocol Discovery), and then tell the default browser to open the result of that first request. Weirdness if the server asked for a redirect when one was not logged in using IE, even when logged in using the default browser. But I'm sure that's not related. – Arjan Jan 4 '16 at 17:31

I thought to have the same issue. However, after having a closer look, it turned out, that Office (V2016 in my case) opened

  • https-URLs in Edge and
  • http-URLs in the defined default browser.

Solution was as follows:

  1. Go to "All Control Panel Items\Default Programs\Set Default Programs"
  2. Select the desired browser
  3. Click "Choose defaults for this program"
  4. Tick HTTPS

It's impertinent that on rolling out major updates Microsoft changes user's defaults.

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