diff --git a/PInvoke/Kernel32/WinBase.File.cs b/PInvoke/Kernel32/WinBase.File.cs
index 4bb7cb541..9f6a8e8d3 100644
--- a/PInvoke/Kernel32/WinBase.File.cs
+++ b/PInvoke/Kernel32/WinBase.File.cs
@@ -1,5 +1,6 @@
 using System.Collections.Generic;
 using System.IO;
+using System.Numerics;
 using System.Threading;
 
 namespace Vanara.PInvoke;
@@ -4047,17 +4048,15 @@ public struct FILE_FULL_DIR_INFO
 		public string FileName;
 	}
 
-	/// <summary>
-	/// <para>Defines a 128-bit file identifier.</para>
-	/// </summary>
+	/// <summary>Defines a 128-bit file identifier.</summary>
 	// https://docs.microsoft.com/en-us/windows/desktop/api/winnt/ns-winnt-_file_id_128 typedef struct _FILE_ID_128 { BYTE
 	// Identifier[16]; } FILE_ID_128, *PFILE_ID_128;
 	[PInvokeData("winnt.h", MSDNShortId = "254ea6a9-e1dd-4b97-91f7-2693065c4bb8")]
-	[StructLayout(LayoutKind.Sequential)]
-	public readonly struct FILE_ID_128
+	[StructLayout(LayoutKind.Sequential, Pack = 1)]
+	public struct FILE_ID_128
 	{
-		private readonly ulong id0;
-		private readonly ulong id1;
+		private ulong id0;
+		private ulong id1;
 
 		/// <summary>
 		/// <para>A byte array containing the 128 bit identifier.</para>
@@ -4066,13 +4065,16 @@ public byte[] Identifier
 		{
 			get
 			{
-				using PinnedObject pin = new(id0);
-				return ((IntPtr)pin).ToByteArray(16)!;
+				var ret = new byte[16];
+				BitConverter.GetBytes(id0).CopyTo(ret, 0);
+				BitConverter.GetBytes(id1).CopyTo(ret, 8);
+				return ret;
 			}
 			set
 			{
-				using PinnedObject pin = new(id0);
-				Marshal.Copy(value, 0, pin, 16);
+				if (value.Length != 16) throw new ArgumentOutOfRangeException("Array must be 16 bytes long.", nameof(value));
+				id0 = BitConverter.ToUInt64(value, 0);
+				id1 = BitConverter.ToUInt64(value, 8);
 			}
 		}
 	}