Where is InitPropVariantFromString?

[optsing]

If I add InitPropVariantFromString to NativeMethods.txt, I get the warning message

Method, type or constant "InitPropVariantFromString" not found. Did you mean or "InitPropVariantFromStringVector" or "InitPropVariantFromStringAsVector"?

Why is this method missing? What is the correct way to create PROPVARIANT without it?

[AArnott]

It's missing from the metadata, but it is a documented function. I've created an issue in the metadata repo: microsoft/win32metadata#1946