net6.0-windows 
namespace System.Runtime.InteropServices
{
    [CLSCompliant(false)]
    [UnsupportedOSPlatform("android")]
    [UnsupportedOSPlatform("browser")]
    [UnsupportedOSPlatform("ios")]
    [UnsupportedOSPlatform("tvos")]
    public abstract class ComWrappers
    {
        protected static void GetIUnknownImpl(out IntPtr fpQueryInterface, out IntPtr fpAddRef, out IntPtr fpRelease);
    }
}
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.NET
5.06.07.08.09.010.0
Information specific to net6.0
Assembly

System.Runtime.InteropServices , Version=6.0.0.0, PublicKeyToken=b03f5f7f11d50a3a

Referencing

Your project needs a package reference to System.Runtime.InteropServices.NFloat.Internal.

Package System.Runtime.InteropServices.NFloat.Internal (6.0.1) net6.0
Platform Restrictions

This API is supported on any platform except for these:

  • Android
  • Browser
  • iOS
  • tvOS
  • Built-in API
  • Package-provided API