Windows.Win32.Foundation.FILETIME is not used in PROPVARIANT

Is your feature request related to a problem? Please describe.
In the PROPVARIANT struct and in PInvoke.PropVariantGetFileTimeElem System.Runtime.InteropServices.ComTypes.FILETIME is used. I think, it may be a good idea to use the FILETIME from namespace Windows.Win32.Foundation. At the moment there is nearly no difference between the System.Runtime.InteropServices.ComTypes.FILETIME and Windows.Win32.Foundation.FILETIME. But in a later version of Windows.Win32.Foundation.FILETIME I expect converters to the .NET type System.DateTime like the code example.

using FT = System.Runtime.InteropServices.ComTypes.FILETIME;

namespace Windows.Win32.Foundation
{
    partial struct FILETIME
    {
        public FILETIME(DateTime dateTime)
        {
            long hFT = dateTime.ToFileTime();
            dwLowDateTime = (uint)(hFT & 0xFFFFFFFF);
            dwHighDateTime = (uint)((ulong)hFT >> 32);
        }

        public FILETIME(FT ft) { dwLowDateTime = (uint)ft.dwLowDateTime; dwHighDateTime = (uint)ft.dwHighDateTime; }

        public DateTime FromFileTime => DateTime.FromFileTime((long)(((ulong)dwHighDateTime) << 32) + dwLowDateTime);

        public FT ToComTypesFileTime
        {
            get
            {
                FT result = new FT();
                result.dwLowDateTime = (int)dwLowDateTime;
                result.dwHighDateTime = (int)dwHighDateTime;
                return result;
            }
        }
    }
}

Describe the solution you'd like
Change the FILETIME in PROPVARIANT, PropVariantGetFileTimeElem, and in other functions (I don't know) and add the extended functions I describe.

Describe alternatives you've considered

Additional context

Start by tracing the PROPVARIANT definition and PInvoke.PropVariantGetFileTimeElem, then identify the other functions that expose System.Runtime.InteropServices.ComTypes.FILETIME. Compare their generated Windows.Win32.Foundation.FILETIME usage with the requested DateTime conversion helpers. Done means the relevant APIs consistently use the Windows.Win32.Foundation type and the requested conversions are covered.