Windows 10 21H1 DisplayVersion 2009??

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w310901
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Windows 10 21H1 DisplayVersion 2009??

Post by w310901 »

what's wrong with my windows 10?
OS: Windows 10 Professional
Version:21H1
BuildID:19043.928

In normal conditions,Windows 10 19043.928 should display as 21H1,but it display as 2009!
what's wrong with my windows 10?

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Joet BERNARD
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Re: Windows 10 21H1 DisplayVersion 2009??

Post by Joet BERNARD »

See "ReleaseId" in your registery.
It says 2009
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Zheng He
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Re: Windows 10 21H1 DisplayVersion 2009??

Post by Zheng He »

Any version starting from 20H2 will have "2009" in ReleaseId for compatibility.

When Microsoft first introduced "rolling" releases, they used a 4-digit release id to indicate a release version, which consists of 2-digit year and 2-digit month, all of which are numbers. A lot of programmers assumed that Microsoft would use this scheme from then on. Therefore, when they want to check the release version, they may convert that 4-digit release id directly to a number so they could compare it. However, Microsoft changed their mind and used "20H2" instead of "2009" from that release. "20H2" includes a letter "H" so the string can't be converted to number. This will break compatibility.

Instead of replacing "2004" with "20H2" directly, they used "2009". So next time when a program tries to convert that string, it won't fail. When a program found that the ReleaseId is "2009", it knows that the version is newer than 2004 so it reads DisplayVersion for the correct release version.

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