net6.0-windows 
namespace System
{
    public static class Environment
    {
        public static bool Is64BitProcess { get; }
    }
}
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.NET 5.06.07.08.09.010.0
.NET Core 2.02.12.23.03.1
.NET Framework 4.04.54.5.14.5.24.64.6.14.6.24.74.7.14.7.24.84.8.1
.NET Standard 2.02.1
Information specific to net6.0
Assembly

System.Runtime , Version=6.0.0.0, PublicKeyToken=b03f5f7f11d50a3a

Referencing

Your project needs a package reference to System.Runtime.Experimental.

Package System.Runtime.Experimental (6.0.2) net6.0
Platform Restrictions

The property getter is supported on all platforms.

  • Built-in API
  • Package-provided API