Hi NndnG,
Per searching, there are several methods you could have a check to enable sound in windows 10 depending on your preferred time rather than coping a sound file from Windows 7.
1.Search "change system sounds", check and modify the option Play Windows Startup sound
2.Create an elevated task to play a sound at sign-in (logon) to Windows 10
Option 2 in below link is guidance on how to manually create task scheduler, which is more recommended.
https://www.tenforums.com/tutorials/94884-how-play-sound-logon-sign-windows-10-a.html
Please note: Information posted in the given link is hosted by a third party. Microsoft does not guarantee the accuracy and effectiveness of information.
Hope this helps and please help to accept as Answer if the response is useful.
Thanks,
Jenny