Fix the TPA in a more reliable way

src/powershell-native/nativemsh/pwrshcommon/NativeMsh.h

@@ -172,14 +172,6 @@ namespace NativeMsh
             __out_ecount(1) int * lpMajorVersion,
             __out_ecount(1) int * lpMinorVersion);
 
-        virtual bool DoesAssemblyExist(
-            std::string& fileToTest);
-
-        virtual void ProbeAssembly(
-            _In_z_ PCSTR directoryPath,
-            _In_z_ PCSTR assemblyName,
-            std::string& result);
-
         virtual void GetTrustedAssemblyList(
             PCSTR coreCLRDirectoryPath,
             std::stringstream& assemblyList,

src/powershell-native/nativemsh/pwrshcommon/SystemCallFacade.h

@@ -55,6 +55,17 @@ namespace NativeMsh
 
         virtual int fclose(
             FILE *stream) = 0;
+
+        virtual HANDLE WINAPI FindFirstFileA(
+            _In_ LPCSTR lpFileName,
+            _Out_ LPWIN32_FIND_DATAA lpFindFileData) = 0;
+
+        virtual BOOL WINAPI FindNextFileA(
+            _In_ HANDLE hFindFile,
+            _Out_ LPWIN32_FIND_DATAA lpFindFileData) = 0;
+
+        virtual BOOL WINAPI FindClose(
+            _Inout_ HANDLE hFindFile) = 0;
     };
 
 } // namespace NativeMsh

src/powershell-native/nativemsh/pwrshcommon/WinSystemCallFacade.cpp

@@ -67,4 +67,24 @@ namespace NativeMsh
         return ::fclose(stream);
     }
 
+    HANDLE WINAPI WinSystemCallFacade::FindFirstFileA(
+        _In_ LPCSTR lpFileName,
+        _Out_ LPWIN32_FIND_DATAA lpFindFileData)
+    {
+        return ::FindFirstFileA(lpFileName, lpFindFileData);
+    }
+
+    BOOL WINAPI WinSystemCallFacade::FindNextFileA(
+        _In_ HANDLE hFindFile,
+        _Out_ LPWIN32_FIND_DATAA lpFindFileData)
+    {
+        return ::FindNextFileA(hFindFile, lpFindFileData);
+    }
+
+    BOOL WINAPI WinSystemCallFacade::FindClose(
+        _Inout_ HANDLE hFindFile)
+    {
+        return ::FindClose(hFindFile);
+    }
+
 } // namespace NativeMsh

src/powershell-native/nativemsh/pwrshcommon/WinSystemCallFacade.h

@@ -53,6 +53,17 @@ namespace NativeMsh
 
         virtual int fclose(
             FILE *stream);
+
+        virtual HANDLE WINAPI FindFirstFileA(
+            _In_ LPCSTR lpFileName,
+            _Out_ LPWIN32_FIND_DATAA lpFindFileData);
+
+        virtual BOOL WINAPI FindNextFileA(
+            _In_ HANDLE hFindFile,
+            _Out_ LPWIN32_FIND_DATAA lpFindFileData);
+
+        virtual BOOL WINAPI FindClose(
+            _Inout_ HANDLE hFindFile);
     };
 
 } // namespace NativeMsh