<PackageReference Include="System.Drawing.Common" Version="10.0.4" />

Windows.Win32.System.Com.StructuredStorage.PROPVARIANT

struct PROPVARIANT
The PROPVARIANT structure is used in the ReadMultiple and WriteMultiple methods of IPropertyStorage to define the type tag and the value of a property in a property set.
namespace Windows.Win32.System.Com.StructuredStorage { internal struct PROPVARIANT { } }