How to open HTML attachment

Hi, I just upgraded to Windows 10 and can not open a HTML attachment on my Microsoft Outlook email.  What do I need to do?
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RizzleConnect With a Mentor Commented:
Control Panel > Security and Maintenance > Change User Account Control Settings (Should be on the left hand side of the page).
Do you get an error when you try to open an attachment?

What version of Office are you running?

Have you ran a repair on the Office suite?

Have you installed all the Windows and Office updates?
David Johnson, CD, MVPOwnerCommented:
Do you have UAC turned off? The default edge browser requires UAC to be active and for you not to be using the default 'administrator' account.  You can change the default browser, windows key, default, select choose a default web browser.
camtzAuthor Commented:
I use Firefox browser.  Where do I find UAC?
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