diff --git a/src/SOS/SOS.Extensions/DebuggerServices.cs b/src/SOS/SOS.Extensions/DebuggerServices.cs
index 98ba7995d8..a6ebabb0c3 100644
--- a/src/SOS/SOS.Extensions/DebuggerServices.cs
+++ b/src/SOS/SOS.Extensions/DebuggerServices.cs
@@ -365,32 +365,32 @@ public HResult AddModuleSymbol(string symbolFileName)
         [StructLayout(LayoutKind.Sequential)]
         private readonly unsafe struct IDebuggerServicesVTable
         {
-            public readonly delegate* unmanaged[Stdcall]<IntPtr, out DebuggerServices.OperatingSystem, HResult> GetOperatingSystem;
-            public readonly delegate* unmanaged[Stdcall]<IntPtr, out DEBUG_CLASS, out DEBUG_CLASS_QUALIFIER, HResult> GetDebuggeeType;
-            public readonly delegate* unmanaged[Stdcall]<IntPtr, out IMAGE_FILE_MACHINE, HResult> GetExecutingProcessorType;
-            public readonly delegate* unmanaged[Stdcall]<IntPtr, byte*, byte*, IntPtr*, int, HResult> AddCommand;
+            public readonly delegate* unmanaged[Stdcall]<IntPtr, out DebuggerServices.OperatingSystem, int> GetOperatingSystem;
+            public readonly delegate* unmanaged[Stdcall]<IntPtr, out DEBUG_CLASS, out DEBUG_CLASS_QUALIFIER, int> GetDebuggeeType;
+            public readonly delegate* unmanaged[Stdcall]<IntPtr, out IMAGE_FILE_MACHINE, int> GetExecutingProcessorType;
+            public readonly delegate* unmanaged[Stdcall]<IntPtr, byte*, byte*, IntPtr*, int, int> AddCommand;
             public readonly delegate* unmanaged[Stdcall]<IntPtr, DEBUG_OUTPUT, byte*, void> OutputString;
-            public readonly delegate* unmanaged[Stdcall]<IntPtr, ulong, byte*, uint, out int, HResult> ReadVirtual;
-            public readonly delegate* unmanaged[Stdcall]<IntPtr, ulong, byte*, uint, out int, HResult> WriteVirtual;
-            public readonly delegate* unmanaged[Stdcall]<IntPtr, out uint, out uint, HResult> GetNumberModules;
-            public readonly delegate* unmanaged[Stdcall]<IntPtr, uint, ulong, byte*, uint, out uint, byte*, uint, uint*, byte*, uint, uint*, HResult> GetModuleNames;
-            public readonly delegate* unmanaged[Stdcall]<IntPtr, uint, out ulong, out ulong, out uint, out uint, HResult> GetModuleInfo;
-            public readonly delegate* unmanaged[Stdcall]<IntPtr, uint, ulong, byte*, byte*, uint, uint*, HResult> GetModuleVersionInformation;
-            public readonly delegate* unmanaged[Stdcall]<IntPtr, out uint, HResult> GetNumberThreads;
-            public readonly delegate* unmanaged[Stdcall]<IntPtr, uint, uint, uint*, uint*, HResult> GetThreadIdsByIndex;
-            public readonly delegate* unmanaged[Stdcall]<IntPtr, uint, uint, uint, byte*, HResult> GetThreadContextBySystemId;
-            public readonly delegate* unmanaged[Stdcall]<IntPtr, out uint, HResult> GetCurrentProcessSystemId;
-            public readonly delegate* unmanaged[Stdcall]<IntPtr, out uint, HResult> GetCurrentThreadSystemId;
-            public readonly delegate* unmanaged[Stdcall]<IntPtr, uint, HResult> SetCurrentThreadSystemId;
-            public readonly delegate* unmanaged[Stdcall]<IntPtr, uint, out ulong, HResult> GetThreadTeb;
-            public readonly delegate* unmanaged[Stdcall]<IntPtr, uint, uint, byte*, HResult> VirtualUnwind;
-            public readonly delegate* unmanaged[Stdcall]<IntPtr, byte*, uint, out uint, HResult> GetSymbolPath;
-            public readonly delegate* unmanaged[Stdcall]<IntPtr, int, ulong, byte*, int, out uint, out ulong, HResult> GetSymbolByOffset;
-            public readonly delegate* unmanaged[Stdcall]<IntPtr, int, byte*, out ulong, HResult> GetOffsetBySymbol;
+            public readonly delegate* unmanaged[Stdcall]<IntPtr, ulong, byte*, uint, out int, int> ReadVirtual;
+            public readonly delegate* unmanaged[Stdcall]<IntPtr, ulong, byte*, uint, out int, int> WriteVirtual;
+            public readonly delegate* unmanaged[Stdcall]<IntPtr, out uint, out uint, int> GetNumberModules;
+            public readonly delegate* unmanaged[Stdcall]<IntPtr, uint, ulong, byte*, uint, out uint, byte*, uint, uint*, byte*, uint, uint*, int> GetModuleNames;
+            public readonly delegate* unmanaged[Stdcall]<IntPtr, uint, out ulong, out ulong, out uint, out uint, int> GetModuleInfo;
+            public readonly delegate* unmanaged[Stdcall]<IntPtr, uint, ulong, byte*, byte*, uint, uint*, int> GetModuleVersionInformation;
+            public readonly delegate* unmanaged[Stdcall]<IntPtr, out uint, int> GetNumberThreads;
+            public readonly delegate* unmanaged[Stdcall]<IntPtr, uint, uint, uint*, uint*, int> GetThreadIdsByIndex;
+            public readonly delegate* unmanaged[Stdcall]<IntPtr, uint, uint, uint, byte*, int> GetThreadContextBySystemId;
+            public readonly delegate* unmanaged[Stdcall]<IntPtr, out uint, int> GetCurrentProcessSystemId;
+            public readonly delegate* unmanaged[Stdcall]<IntPtr, out uint, int> GetCurrentThreadSystemId;
+            public readonly delegate* unmanaged[Stdcall]<IntPtr, uint, int> SetCurrentThreadSystemId;
+            public readonly delegate* unmanaged[Stdcall]<IntPtr, uint, out ulong, int> GetThreadTeb;
+            public readonly delegate* unmanaged[Stdcall]<IntPtr, uint, uint, byte*, int> VirtualUnwind;
+            public readonly delegate* unmanaged[Stdcall]<IntPtr, byte*, uint, out uint, int> GetSymbolPath;
+            public readonly delegate* unmanaged[Stdcall]<IntPtr, int, ulong, byte*, int, out uint, out ulong, int> GetSymbolByOffset;
+            public readonly delegate* unmanaged[Stdcall]<IntPtr, int, byte*, out ulong, int> GetOffsetBySymbol;
             public readonly delegate* unmanaged[Stdcall]<IntPtr, uint> GetOutputWidth;
-            public readonly delegate* unmanaged[Stdcall]<IntPtr, uint*, HResult> SupportsDml;
+            public readonly delegate* unmanaged[Stdcall]<IntPtr, uint*, int> SupportsDml;
             public readonly delegate* unmanaged[Stdcall]<IntPtr, DEBUG_OUTPUT, byte*, void> OutputDmlString;
-            public readonly delegate* unmanaged[Stdcall]<IntPtr, IntPtr, byte*, HResult> AddModuleSymbol;
+            public readonly delegate* unmanaged[Stdcall]<IntPtr, IntPtr, byte*, int> AddModuleSymbol;
         }
     }
 }
diff --git a/src/SOS/SOS.Extensions/RemoteMemoryService.cs b/src/SOS/SOS.Extensions/RemoteMemoryService.cs
index 70aa7598ef..307b657444 100644
--- a/src/SOS/SOS.Extensions/RemoteMemoryService.cs
+++ b/src/SOS/SOS.Extensions/RemoteMemoryService.cs
@@ -35,8 +35,8 @@ public bool FreeMemory(ulong address, uint size, uint typeFlags)
         [StructLayout(LayoutKind.Sequential)]
         private readonly unsafe struct IRemoteMemoryServiceVTable
         {
-            public readonly delegate* unmanaged[Stdcall]<IntPtr, ulong, uint, uint, uint, out ulong, HResult> AllocVirtual;
-            public readonly delegate* unmanaged[Stdcall]<IntPtr, ulong, uint, uint, HResult> FreeVirtual;
+            public readonly delegate* unmanaged[Stdcall]<IntPtr, ulong, uint, uint, uint, out ulong, int> AllocVirtual;
+            public readonly delegate* unmanaged[Stdcall]<IntPtr, ulong, uint, uint, int> FreeVirtual;
         }
     }
 }
diff --git a/src/SOS/SOS.Hosting/DataTargetWrapper.cs b/src/SOS/SOS.Hosting/DataTargetWrapper.cs
index 48e4e2fbb3..826143d224 100644
--- a/src/SOS/SOS.Hosting/DataTargetWrapper.cs
+++ b/src/SOS/SOS.Hosting/DataTargetWrapper.cs
@@ -101,7 +101,7 @@ protected override void Destroy()
 
         #region ICLRDataTarget
 
-        private HResult GetMachineType(
+        private int GetMachineType(
             IntPtr self,
             out IMAGE_FILE_MACHINE machineType)
         {
@@ -121,7 +121,7 @@ private HResult GetMachineType(
             return HResult.S_OK;
         }
 
-        private HResult GetPointerSize(
+        private int GetPointerSize(
             IntPtr self,
             out int pointerSize)
         {
@@ -129,7 +129,7 @@ private HResult GetPointerSize(
             return HResult.S_OK;
         }
 
-        private HResult GetImageBase(
+        private int GetImageBase(
             IntPtr self,
             string imagePath,
             out ulong baseAddress)
@@ -144,7 +144,7 @@ private HResult GetImageBase(
             return HResult.E_FAIL;
         }
 
-        private HResult ReadVirtual(
+        private int ReadVirtual(
             IntPtr self,
             ulong address,
             IntPtr buffer,
@@ -163,7 +163,7 @@ private HResult ReadVirtual(
             return HResult.S_OK;
         }
 
-        private HResult WriteVirtual(
+        private int WriteVirtual(
             IntPtr self,
             ulong address,
             IntPtr buffer,
@@ -180,7 +180,7 @@ private HResult WriteVirtual(
             return HResult.S_OK;
         }
 
-        private HResult GetTLSValue(
+        private int GetTLSValue(
             IntPtr self,
             uint threadId,
             uint index,
@@ -189,7 +189,7 @@ private HResult GetTLSValue(
             return HResult.E_NOTIMPL;
         }
 
-        private HResult SetTLSValue(
+        private int SetTLSValue(
             IntPtr self,
             uint threadId,
             uint index,
@@ -198,7 +198,7 @@ private HResult SetTLSValue(
             return HResult.E_NOTIMPL;
         }
 
-        private HResult GetCurrentThreadID(
+        private int GetCurrentThreadID(
             IntPtr self,
             out uint threadId)
         {
@@ -212,7 +212,7 @@ private HResult GetCurrentThreadID(
             return HResult.E_FAIL;
         }
 
-        private HResult GetThreadContext(
+        private int GetThreadContext(
             IntPtr self,
             uint threadId,
             uint contextFlags,
@@ -241,7 +241,7 @@ private HResult GetThreadContext(
             return HResult.S_OK;
         }
 
-        private HResult SetThreadContext(
+        private int SetThreadContext(
             IntPtr self,
             uint threadId,
             int contextSize,
@@ -250,7 +250,7 @@ private HResult SetThreadContext(
             return HResult.E_NOTIMPL;
         }
 
-        private HResult Request(
+        private int Request(
             IntPtr self,
             uint reqCode,
             uint inBufferSize,
@@ -265,7 +265,7 @@ private HResult Request(
 
         #region ICLRDataTarget2
 
-        private HResult AllocVirtual(
+        private int AllocVirtual(
             IntPtr self,
             ulong address,
             uint size,
@@ -283,7 +283,7 @@ private HResult AllocVirtual(
             return HResult.S_OK;
         }
 
-        private HResult FreeVirtual(
+        private int FreeVirtual(
             IntPtr self,
             ulong address,
             uint size,
@@ -325,7 +325,7 @@ private int VirtualUnwind(
 
         #region ICLRMetadataLocator
 
-        private HResult GetMetadata(
+        private int GetMetadata(
             IntPtr self,
             string fileName,
             uint imageTimestamp,
@@ -344,7 +344,7 @@ private HResult GetMetadata(
 
         #region ICLRRuntimeLocator
 
-        private HResult GetRuntimeBase(
+        private int GetRuntimeBase(
             IntPtr self,
             out ulong address)
         {
@@ -357,23 +357,23 @@ private HResult GetRuntimeBase(
         #region ICLRDataTarget delegates
 
         [UnmanagedFunctionPointer(CallingConvention.Winapi)]
-        private delegate HResult GetMachineTypeDelegate(
+        private delegate int GetMachineTypeDelegate(
             [In] IntPtr self,
             [Out] out IMAGE_FILE_MACHINE machineType);
 
         [UnmanagedFunctionPointer(CallingConvention.Winapi)]
-        private delegate HResult GetPointerSizeDelegate(
+        private delegate int GetPointerSizeDelegate(
             [In] IntPtr self,
             [Out] out int pointerSize);
 
         [UnmanagedFunctionPointer(CallingConvention.Winapi)]
-        private delegate HResult GetImageBaseDelegate(
+        private delegate int GetImageBaseDelegate(
             [In] IntPtr self,
             [In][MarshalAs(UnmanagedType.LPWStr)] string imagePath,
             [Out] out ulong baseAddress);
 
         [UnmanagedFunctionPointer(CallingConvention.Winapi)]
-        private delegate HResult ReadVirtualDelegate(
+        private delegate int ReadVirtualDelegate(
             [In] IntPtr self,
             [In] ulong address,
             [In] IntPtr buffer,
@@ -381,7 +381,7 @@ private delegate HResult ReadVirtualDelegate(
             [Out] uint* bytesRead);
 
         [UnmanagedFunctionPointer(CallingConvention.Winapi)]
-        private delegate HResult WriteVirtualDelegate(
+        private delegate int WriteVirtualDelegate(
             [In] IntPtr self,
             [In] ulong address,
             [In] IntPtr buffer,
@@ -389,26 +389,26 @@ private delegate HResult WriteVirtualDelegate(
             [Out] uint* bytesWritten);
 
         [UnmanagedFunctionPointer(CallingConvention.Winapi)]
-        private delegate HResult GetTLSValueDelegate(
+        private delegate int GetTLSValueDelegate(
             [In] IntPtr self,
             [In] uint threadId,
             [In] uint index,
             [Out] ulong* value);
 
         [UnmanagedFunctionPointer(CallingConvention.Winapi)]
-        private delegate HResult SetTLSValueDelegate(
+        private delegate int SetTLSValueDelegate(
             [In] IntPtr self,
             [In] uint threadId,
             [In] uint index,
             [In] ulong value);
 
         [UnmanagedFunctionPointer(CallingConvention.Winapi)]
-        private delegate HResult GetCurrentThreadIDDelegate(
+        private delegate int GetCurrentThreadIDDelegate(
             [In] IntPtr self,
             [Out] out uint threadId);
 
         [UnmanagedFunctionPointer(CallingConvention.Winapi)]
-        private delegate HResult GetThreadContextDelegate(
+        private delegate int GetThreadContextDelegate(
             [In] IntPtr self,
             [In] uint threadId,
             [In] uint contextFlags,
@@ -416,14 +416,14 @@ private delegate HResult GetThreadContextDelegate(
             [Out] IntPtr context);
 
         [UnmanagedFunctionPointer(CallingConvention.Winapi)]
-        private delegate HResult SetThreadContextDelegate(
+        private delegate int SetThreadContextDelegate(
             [In] IntPtr self,
             [In] uint threadId,
             [In] int contextSize,
             [In] IntPtr context);
 
         [UnmanagedFunctionPointer(CallingConvention.Winapi)]
-        private delegate HResult RequestDelegate(
+        private delegate int RequestDelegate(
             [In] IntPtr self,
             [In] uint reqCode,
             [In] uint inBufferSize,
@@ -436,7 +436,7 @@ private delegate HResult RequestDelegate(
         #region ICLRDataTarget2 delegates
 
         [UnmanagedFunctionPointer(CallingConvention.Winapi)]
-        private delegate HResult AllocVirtualDelegate(
+        private delegate int AllocVirtualDelegate(
             [In] IntPtr self,
             [In] ulong address,
             [In] uint size,
@@ -445,7 +445,7 @@ private delegate HResult AllocVirtualDelegate(
             [Out] ulong* buffer);
 
         [UnmanagedFunctionPointer(CallingConvention.Winapi)]
-        private delegate HResult FreeVirtualDelegate(
+        private delegate int FreeVirtualDelegate(
             [In] IntPtr self,
             [In] ulong address,
             [In] uint size,
@@ -467,7 +467,7 @@ private delegate int VirtualUnwindDelegate(
         #region ICLRMetadataLocator delegate
 
         [UnmanagedFunctionPointer(CallingConvention.Winapi)]
-        private delegate HResult GetMetadataDelegate(
+        private delegate int GetMetadataDelegate(
             [In] IntPtr self,
             [In][MarshalAs(UnmanagedType.LPWStr)] string fileName,
             [In] uint imageTimestamp,
@@ -484,7 +484,7 @@ [In] [MarshalAs(UnmanagedType.LPArray, SizeConst = 16)] byte[] mvid,
         #region ICLRRuntimeLocator delegate
 
         [UnmanagedFunctionPointer(CallingConvention.Winapi)]
-        private delegate HResult GetRuntimeBaseDelegate(
+        private delegate int GetRuntimeBaseDelegate(
             [In] IntPtr self,
             [Out] out ulong address);
 
diff --git a/src/SOS/SOS.Hosting/HostWrapper.cs b/src/SOS/SOS.Hosting/HostWrapper.cs
index e1fb16bb27..5b9a2c17de 100644
--- a/src/SOS/SOS.Hosting/HostWrapper.cs
+++ b/src/SOS/SOS.Hosting/HostWrapper.cs
@@ -48,7 +48,7 @@ public HostWrapper(IHost host, Func<TargetWrapper> getTarget)
         /// </summary>
         /// <param name="targetWrapper">target wrapper address returned</param>
         /// <returns>S_OK</returns>
-        private HResult GetCurrentTarget(IntPtr self, out IntPtr targetWrapper)
+        private int GetCurrentTarget(IntPtr self, out IntPtr targetWrapper)
         {
             TargetWrapper wrapper = _getTarget();
             if (wrapper == null)
@@ -70,13 +70,13 @@ private delegate HostType GetHostTypeDelegate(
             [In] IntPtr self);
 
         [UnmanagedFunctionPointer(CallingConvention.Winapi)]
-        internal delegate HResult GetServiceDelegate(
+        internal delegate int GetServiceDelegate(
             [In] IntPtr self,
             [In] in Guid guid,
             [Out] out IntPtr ptr);
 
         [UnmanagedFunctionPointer(CallingConvention.Winapi)]
-        private delegate HResult GetCurrentTargetDelegate(
+        private delegate int GetCurrentTargetDelegate(
             [In] IntPtr self,
             [Out] out IntPtr target);
 
diff --git a/src/SOS/SOS.Hosting/ServiceWrapper.cs b/src/SOS/SOS.Hosting/ServiceWrapper.cs
index 7dbf7dc016..43ac85e9a6 100644
--- a/src/SOS/SOS.Hosting/ServiceWrapper.cs
+++ b/src/SOS/SOS.Hosting/ServiceWrapper.cs
@@ -87,7 +87,7 @@ public COMCallableIUnknown GetServiceWrapper(in Guid serviceId)
         /// <param name="serviceId">guid of the service</param>
         /// <param name="service">pointer to return service instance</param>
         /// <returns>S_OK or E_NOINTERFACE</returns>
-        public HResult GetService(IntPtr self, in Guid guid, out IntPtr ptr)
+        public int GetService(IntPtr self, in Guid guid, out IntPtr ptr)
         {
             ptr = IntPtr.Zero;
 
diff --git a/src/SOS/SOS.Hosting/TargetWrapper.cs b/src/SOS/SOS.Hosting/TargetWrapper.cs
index e20be17d98..6a5531814f 100644
--- a/src/SOS/SOS.Hosting/TargetWrapper.cs
+++ b/src/SOS/SOS.Hosting/TargetWrapper.cs
@@ -82,7 +82,7 @@ private string GetTempDirectory(
             return _target.GetTempDirectory();
         }
 
-        private HResult GetRuntime(
+        private int GetRuntime(
             IntPtr self,
             IntPtr* ppRuntime)
         {
@@ -120,7 +120,7 @@ private delegate string GetTempDirectoryDelegate(
             [In] IntPtr self);
 
         [UnmanagedFunctionPointer(CallingConvention.Winapi)]
-        private delegate HResult GetRuntimeDelegate(
+        private delegate int GetRuntimeDelegate(
             [In] IntPtr self,
             [Out] IntPtr* ppRuntime);