How to detect Office 2019 programmatically?

Question

We are used to detect the currently installed Office version by getting the full version (e.g. from the file info of an installed Office executable) and map the mayor versi

Answer 1

From what we have found out the Office version numbers/build numbers can be the same for Office 2016, 2019 and Office 365.

Office 2016 and 2019 are supposed to have frozen feature sets while Office 365 will auto-update with new features. At some stage O365 and other build numbers will overlap. We found also that Office 2016 installed with Click-to-Run may have the same build number as 2019, although it is meant to contain security updates only.

Office 2016 installed with MSI will have a static build number. There's no MSI installer for Office 2019, meaning it will auto-update and its build numbers might increase the same way as the ones for Office 365?

In any case: it is no longer possible to determine the Office version from the build number. We have resorted to look up the following registry key in addition:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Office\ClickToRun 

If it doesn't exist and the major version number is 16 it is an Office 2016 MSI install.

If it exists, you know it's a Click-to-Run installation and you can examine the following subkey value from which you can infer 2016, 2019 or 365:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Office\ClickToRun\Configuration\ProductReleaseIDs 

Example values are "O365ProPlusRetail" or "ProPlus2019Retail" or just "ProPlusRetail"

Any better suggestions welcome.