Looks like Microsoft may have dropped the ReleaseID versioning starting in 21H1, based on local fixlet debugger on my personal machine with the 10.0.19043.928 Insider Preview. The inspectors shows it as a 2009 releaseid. Since 20H1 I’ve seen there is a “DisplayVersion” under “HKLM\Software\Microsoft\Windows NT\CurrentVersion” that gives the version on the H1/H2 naming convention MS adopted in 2020. This from a 10.0.2.52 debugger
Q: releaseid of operating system
A: 2009
T: 5.616 ms
I: singular string
Q: operating system
A: Win10 10.0.19043.928 (2009)
T: 5.487 ms
I: singular operating system
Q: values "DisplayVersion" of key "HKLM\Software\Microsoft\Windows NT\CurrentVersion" of native registry
A: 21H1
T: 5.254 ms
I: plural registry key value
Q: values "ReleaseID" of key "HKLM\Software\Microsoft\Windows NT\CurrentVersion" of native registry
A: 2009
T: 5.142 ms
I: plural registry key value
From the OS (though I think even MS don’t quite get the info right as this build was installed in the past few days)
| Edition | Windows 10 Pro |
|---|---|
| Version | 21H1 |
| Installed on | 14/12/2019 |
| OS build | 19043.928 |
| Experience | Windows Feature Experience Pack 120.2212.3530.0 |