It is a LICENSING issue.
The ONLY Windows version that came with free DVD software player is Windows 7. You had to pay extra money for Windows XP Media Center Edition, Windows Vista Home Premium, and Windows 8 Media Center Pack.
It is clearly spelt out in Dolby's licensing agreement. If you want Edge browser to play Dolby Audio stuff, then pay for it.
Quote:
"Windows Licensing Program
If you would like to license the Dolby Audio™ technologies included in the Microsoft Windows® operating system, please complete the questionnaire on the Windows Licensing Program page and indicate how many devices your OEM company will be making per year. Based on your response, we will assist you with obtaining a new licensing agreement to support the use of Dolby Audio™ (supporting Dolby Digital Plus™) in Windows and which will be natively supported by the new Microsoft Edge browser for the playback of web-based content as well as accessible by third-party Windows Store and Universal apps. You must have an agreement with Dolby prior to the shipment of any Windows devices."
https://professional.dolby.com/licensing/
What does Microsoft has to do with this? In the last 20 years, Microsoft only paid for it for 3 years when Windows 7 came out.
The sooner people realize that this is a MONEY issue that nobody is paying for it, the sooner people will stop complaining Microsoft for not fixing a "technical" issue.