diff --git a/src/coreclr/src/vm/method.cpp b/src/coreclr/src/vm/method.cpp
index 314b777052cd8..690051b905bf8 100644
--- a/src/coreclr/src/vm/method.cpp
+++ b/src/coreclr/src/vm/method.cpp
@@ -5307,6 +5307,23 @@ FARPROC NDirectMethodDesc::FindEntryPointWithMangling(NATIVE_LIBRARY_HANDLE hMod
 
     return pFunc;
 }
+
+FARPROC NDirectMethodDesc::FindEntryPointWithSuffix(NATIVE_LIBRARY_HANDLE hMod, PTR_CUTF8 entryPointName, char suffix) const
+{
+    // Allocate space for a copy of the entry point name.
+    DWORD entryPointWithSuffixLen = (DWORD)(strlen(entryPointName) + 1); // +1 for charset decorations
+    int dstbufsize = (int)(sizeof(char) * (entryPointWithSuffixLen + 1)); // +1 for the null terminator
+    LPSTR entryPointWithSuffix = ((LPSTR)_alloca(dstbufsize));
+
+    // Copy the name so we can mangle it.
+    strcpy_s(entryPointWithSuffix, dstbufsize, entryPointName);
+    entryPointWithSuffix[entryPointWithSuffixLen] = '\0'; // Null terminator
+    entryPointWithSuffix[entryPointWithSuffixLen - 1] = suffix; // Charset suffix
+
+    // Look for entry point with the suffix based on charset
+    return FindEntryPointWithMangling(hMod, entryPointWithSuffix);
+}
+
 #endif
 
 //*******************************************************************************
@@ -5332,39 +5349,27 @@ LPVOID NDirectMethodDesc::FindEntryPoint(NATIVE_LIBRARY_HANDLE hMod) const
         return reinterpret_cast<LPVOID>(GetProcAddress(hMod, (LPCSTR)(size_t)((UINT16)ordinal)));
     }
 
-    // Just look for the user-provided name without charset suffixes.
-    // If  it is unicode fcn, we are going
-    // to need to check for the 'W' API because it takes precedence over the
-    // unmangled one (on NT some APIs have unmangled ANSI exports).
-    FARPROC pFunc = FindEntryPointWithMangling(hMod, funcName);
-    if ((pFunc != NULL && IsNativeAnsi()) || IsNativeNoMangled())
+    FARPROC pFunc = NULL;
+    if (IsNativeNoMangled())
     {
-        return reinterpret_cast<LPVOID>(pFunc);
+        // Look for the user-provided entry point name only
+        pFunc = FindEntryPointWithMangling(hMod, funcName);
     }
-
-    DWORD probedEntrypointNameLength = (DWORD)(strlen(funcName) + 1); // +1 for charset decorations
-
-    // Allocate space for a copy of the entry point name.
-    int dstbufsize = (int)(sizeof(char) * (probedEntrypointNameLength + 1)); // +1 for the null terminator
-
-    LPSTR szProbedEntrypointName = ((LPSTR)_alloca(dstbufsize));
-
-    // Copy the name so we can mangle it.
-    strcpy_s(szProbedEntrypointName, dstbufsize, funcName);
-    szProbedEntrypointName[probedEntrypointNameLength] = '\0'; // Add an extra '\0'.
-
-    if(!IsNativeNoMangled())
+    else if (IsNativeAnsi())
     {
-        szProbedEntrypointName[probedEntrypointNameLength - 1] = IsNativeAnsi() ? 'A' : 'W';
-
-        FARPROC pProbedFunc = FindEntryPointWithMangling(hMod, szProbedEntrypointName);
-
-        if(pProbedFunc != NULL)
-        {
-            pFunc = pProbedFunc;
-        }
-
-        probedEntrypointNameLength++;
+        // For ANSI, look for the user-provided entry point name first.
+        // If that does not exist, try the charset suffix.
+        pFunc = FindEntryPointWithMangling(hMod, funcName);
+        if (pFunc == NULL)
+            pFunc = FindEntryPointWithSuffix(hMod, funcName, 'A');
+    }
+    else
+    {
+        // For Unicode, look for the entry point name with the charset suffix first.
+        // The 'W' API takes precedence over the undecorated one.
+        pFunc = FindEntryPointWithSuffix(hMod, funcName, 'W');
+        if (pFunc == NULL)
+            pFunc = FindEntryPointWithMangling(hMod, funcName);
     }
 
     return reinterpret_cast<LPVOID>(pFunc);
diff --git a/src/coreclr/src/vm/method.hpp b/src/coreclr/src/vm/method.hpp
index 8870e7a5f5a23..ba5f6ae096778 100644
--- a/src/coreclr/src/vm/method.hpp
+++ b/src/coreclr/src/vm/method.hpp
@@ -3150,6 +3150,7 @@ class NDirectMethodDesc : public MethodDesc
 #ifdef TARGET_WINDOWS
 private:
     FARPROC FindEntryPointWithMangling(NATIVE_LIBRARY_HANDLE mod, PTR_CUTF8 entryPointName) const;
+    FARPROC FindEntryPointWithSuffix(NATIVE_LIBRARY_HANDLE mod, PTR_CUTF8 entryPointName, char suffix) const;
 #endif
 public:
 
diff --git a/src/libraries/Common/src/Interop/Windows/Advapi32/Interop.RegCreateKeyEx.cs b/src/libraries/Common/src/Interop/Windows/Advapi32/Interop.RegCreateKeyEx.cs
index bb9da06c11d48..3caac3041f920 100644
--- a/src/libraries/Common/src/Interop/Windows/Advapi32/Interop.RegCreateKeyEx.cs
+++ b/src/libraries/Common/src/Interop/Windows/Advapi32/Interop.RegCreateKeyEx.cs
@@ -16,7 +16,7 @@ internal static partial class Advapi32
     {
         // Note: RegCreateKeyEx won't set the last error on failure - it returns
         // an error code if it fails.
-        [DllImport(Libraries.Advapi32, CharSet = CharSet.Unicode, BestFitMapping = false, EntryPoint = "RegCreateKeyExW")]
+        [DllImport(Libraries.Advapi32, CharSet = CharSet.Unicode, BestFitMapping = false, EntryPoint = "RegCreateKeyExW", ExactSpelling = true)]
         internal static extern int RegCreateKeyEx(
             SafeRegistryHandle hKey,
             string lpSubKey,
diff --git a/src/libraries/Common/src/Interop/Windows/Advapi32/Interop.RegDeleteKeyEx.cs b/src/libraries/Common/src/Interop/Windows/Advapi32/Interop.RegDeleteKeyEx.cs
index 487caf8b6d79d..2fff3b1ed5164 100644
--- a/src/libraries/Common/src/Interop/Windows/Advapi32/Interop.RegDeleteKeyEx.cs
+++ b/src/libraries/Common/src/Interop/Windows/Advapi32/Interop.RegDeleteKeyEx.cs
@@ -13,7 +13,7 @@ internal static partial class Interop
 {
     internal static partial class Advapi32
     {
-        [DllImport(Libraries.Advapi32, CharSet = CharSet.Unicode, BestFitMapping = false, EntryPoint = "RegDeleteKeyExW")]
+        [DllImport(Libraries.Advapi32, CharSet = CharSet.Unicode, BestFitMapping = false, EntryPoint = "RegDeleteKeyExW", ExactSpelling = true)]
         internal static extern int RegDeleteKeyEx(SafeRegistryHandle hKey, string lpSubKey, int samDesired, int Reserved);
     }
 }
diff --git a/src/libraries/Common/src/Interop/Windows/Advapi32/Interop.RegDeleteValue.cs b/src/libraries/Common/src/Interop/Windows/Advapi32/Interop.RegDeleteValue.cs
index 43cf683c2bddf..7bb376930fa75 100644
--- a/src/libraries/Common/src/Interop/Windows/Advapi32/Interop.RegDeleteValue.cs
+++ b/src/libraries/Common/src/Interop/Windows/Advapi32/Interop.RegDeleteValue.cs
@@ -14,7 +14,7 @@ internal static partial class Interop
 {
     internal static partial class Advapi32
     {
-        [DllImport(Libraries.Advapi32, CharSet = CharSet.Unicode, BestFitMapping = false, EntryPoint = "RegDeleteValueW")]
+        [DllImport(Libraries.Advapi32, CharSet = CharSet.Unicode, BestFitMapping = false, EntryPoint = "RegDeleteValueW", ExactSpelling = true)]
         internal static extern int RegDeleteValue(SafeRegistryHandle hKey, string? lpValueName);
     }
 }
diff --git a/src/libraries/Common/src/Interop/Windows/Advapi32/Interop.RegEnumKeyEx.cs b/src/libraries/Common/src/Interop/Windows/Advapi32/Interop.RegEnumKeyEx.cs
index 11165cc91a966..d618b50cd1cd8 100644
--- a/src/libraries/Common/src/Interop/Windows/Advapi32/Interop.RegEnumKeyEx.cs
+++ b/src/libraries/Common/src/Interop/Windows/Advapi32/Interop.RegEnumKeyEx.cs
@@ -14,7 +14,7 @@ internal static partial class Interop
 {
     internal static partial class Advapi32
     {
-        [DllImport(Libraries.Advapi32, CharSet = CharSet.Unicode, BestFitMapping = false, EntryPoint = "RegEnumKeyExW")]
+        [DllImport(Libraries.Advapi32, CharSet = CharSet.Unicode, BestFitMapping = false, EntryPoint = "RegEnumKeyExW", ExactSpelling = true)]
         internal static extern unsafe int RegEnumKeyEx(
             SafeRegistryHandle hKey,
             int dwIndex,
diff --git a/src/libraries/Common/src/Interop/Windows/Advapi32/Interop.RegEnumValue.cs b/src/libraries/Common/src/Interop/Windows/Advapi32/Interop.RegEnumValue.cs
index e2ab45dea1933..02a7ad9692844 100644
--- a/src/libraries/Common/src/Interop/Windows/Advapi32/Interop.RegEnumValue.cs
+++ b/src/libraries/Common/src/Interop/Windows/Advapi32/Interop.RegEnumValue.cs
@@ -15,7 +15,7 @@ internal static partial class Interop
 {
     internal static partial class Advapi32
     {
-        [DllImport(Libraries.Advapi32, CharSet = CharSet.Unicode, BestFitMapping = false, EntryPoint = "RegEnumValueW")]
+        [DllImport(Libraries.Advapi32, CharSet = CharSet.Unicode, BestFitMapping = false, EntryPoint = "RegEnumValueW", ExactSpelling = true)]
         internal static extern unsafe int RegEnumValue(
             SafeRegistryHandle hKey,
             int dwIndex,
diff --git a/src/libraries/Common/src/Interop/Windows/Advapi32/Interop.RegOpenKeyEx.cs b/src/libraries/Common/src/Interop/Windows/Advapi32/Interop.RegOpenKeyEx.cs
index 5f5b6b6e372ed..0bc2cdce3c836 100644
--- a/src/libraries/Common/src/Interop/Windows/Advapi32/Interop.RegOpenKeyEx.cs
+++ b/src/libraries/Common/src/Interop/Windows/Advapi32/Interop.RegOpenKeyEx.cs
@@ -15,7 +15,7 @@ internal static partial class Interop
 {
     internal static partial class Advapi32
     {
-        [DllImport(Libraries.Advapi32, CharSet = CharSet.Unicode, BestFitMapping = false, EntryPoint = "RegOpenKeyExW")]
+        [DllImport(Libraries.Advapi32, CharSet = CharSet.Unicode, BestFitMapping = false, EntryPoint = "RegOpenKeyExW", ExactSpelling = true)]
         internal static extern int RegOpenKeyEx(
             SafeRegistryHandle hKey,
             string? lpSubKey,
@@ -24,7 +24,7 @@ internal static extern int RegOpenKeyEx(
             out SafeRegistryHandle hkResult);
 
 
-        [DllImport(Libraries.Advapi32, CharSet = CharSet.Unicode, BestFitMapping = false, EntryPoint = "RegOpenKeyExW")]
+        [DllImport(Libraries.Advapi32, CharSet = CharSet.Unicode, BestFitMapping = false, EntryPoint = "RegOpenKeyExW", ExactSpelling = true)]
         internal static extern int RegOpenKeyEx(
             IntPtr hKey,
             string? lpSubKey,
diff --git a/src/libraries/Common/src/Interop/Windows/Advapi32/Interop.RegQueryValueEx.cs b/src/libraries/Common/src/Interop/Windows/Advapi32/Interop.RegQueryValueEx.cs
index 72b8aa8f7bcf1..bde703ad18632 100644
--- a/src/libraries/Common/src/Interop/Windows/Advapi32/Interop.RegQueryValueEx.cs
+++ b/src/libraries/Common/src/Interop/Windows/Advapi32/Interop.RegQueryValueEx.cs
@@ -14,7 +14,7 @@ internal static partial class Interop
 {
     internal static partial class Advapi32
     {
-        [DllImport(Libraries.Advapi32, CharSet = CharSet.Unicode, BestFitMapping = false, EntryPoint = "RegQueryValueExW")]
+        [DllImport(Libraries.Advapi32, CharSet = CharSet.Unicode, BestFitMapping = false, EntryPoint = "RegQueryValueExW", ExactSpelling = true)]
         internal static extern int RegQueryValueEx(
             SafeRegistryHandle hKey,
             string? lpValueName,
@@ -23,7 +23,7 @@ internal static extern int RegQueryValueEx(
             [Out] byte[]? lpData,
             ref int lpcbData);
 
-        [DllImport(Libraries.Advapi32, CharSet = CharSet.Unicode, BestFitMapping = false, EntryPoint = "RegQueryValueExW")]
+        [DllImport(Libraries.Advapi32, CharSet = CharSet.Unicode, BestFitMapping = false, EntryPoint = "RegQueryValueExW", ExactSpelling = true)]
         internal static extern int RegQueryValueEx(
             SafeRegistryHandle hKey,
             string? lpValueName,
@@ -32,7 +32,7 @@ internal static extern int RegQueryValueEx(
             ref int lpData,
             ref int lpcbData);
 
-        [DllImport(Libraries.Advapi32, CharSet = CharSet.Unicode, BestFitMapping = false, EntryPoint = "RegQueryValueExW")]
+        [DllImport(Libraries.Advapi32, CharSet = CharSet.Unicode, BestFitMapping = false, EntryPoint = "RegQueryValueExW", ExactSpelling = true)]
         internal static extern int RegQueryValueEx(
             SafeRegistryHandle hKey,
             string? lpValueName,
@@ -41,7 +41,7 @@ internal static extern int RegQueryValueEx(
             ref long lpData,
             ref int lpcbData);
 
-        [DllImport(Libraries.Advapi32, CharSet = CharSet.Unicode, BestFitMapping = false, EntryPoint = "RegQueryValueExW")]
+        [DllImport(Libraries.Advapi32, CharSet = CharSet.Unicode, BestFitMapping = false, EntryPoint = "RegQueryValueExW", ExactSpelling = true)]
         internal static extern int RegQueryValueEx(
             SafeRegistryHandle hKey,
             string? lpValueName,
diff --git a/src/libraries/Common/src/Interop/Windows/Advapi32/Interop.RegSetValueEx.cs b/src/libraries/Common/src/Interop/Windows/Advapi32/Interop.RegSetValueEx.cs
index 847d28fa1c577..72cee21e1a17b 100644
--- a/src/libraries/Common/src/Interop/Windows/Advapi32/Interop.RegSetValueEx.cs
+++ b/src/libraries/Common/src/Interop/Windows/Advapi32/Interop.RegSetValueEx.cs
@@ -14,7 +14,7 @@ internal static partial class Interop
 {
     internal static partial class Advapi32
     {
-        [DllImport(Libraries.Advapi32, CharSet = CharSet.Unicode, BestFitMapping = false, EntryPoint = "RegSetValueExW")]
+        [DllImport(Libraries.Advapi32, CharSet = CharSet.Unicode, BestFitMapping = false, EntryPoint = "RegSetValueExW", ExactSpelling = true)]
         internal static extern int RegSetValueEx(
             SafeRegistryHandle hKey,
             string? lpValueName,
@@ -23,7 +23,7 @@ internal static extern int RegSetValueEx(
             byte[]? lpData,
             int cbData);
 
-        [DllImport(Libraries.Advapi32, CharSet = CharSet.Unicode, BestFitMapping = false, EntryPoint = "RegSetValueExW")]
+        [DllImport(Libraries.Advapi32, CharSet = CharSet.Unicode, BestFitMapping = false, EntryPoint = "RegSetValueExW", ExactSpelling = true)]
         internal static extern int RegSetValueEx(
             SafeRegistryHandle hKey,
             string? lpValueName,
@@ -32,7 +32,7 @@ internal static extern int RegSetValueEx(
             char[]? lpData,
             int cbData);
 
-        [DllImport(Libraries.Advapi32, CharSet = CharSet.Unicode, BestFitMapping = false, EntryPoint = "RegSetValueExW")]
+        [DllImport(Libraries.Advapi32, CharSet = CharSet.Unicode, BestFitMapping = false, EntryPoint = "RegSetValueExW", ExactSpelling = true)]
         internal static extern int RegSetValueEx(
             SafeRegistryHandle hKey,
             string? lpValueName,
@@ -41,7 +41,7 @@ internal static extern int RegSetValueEx(
             ref int lpData,
             int cbData);
 
-        [DllImport(Libraries.Advapi32, CharSet = CharSet.Unicode, BestFitMapping = false, EntryPoint = "RegSetValueExW")]
+        [DllImport(Libraries.Advapi32, CharSet = CharSet.Unicode, BestFitMapping = false, EntryPoint = "RegSetValueExW", ExactSpelling = true)]
         internal static extern int RegSetValueEx(
             SafeRegistryHandle hKey,
             string? lpValueName,
@@ -50,7 +50,7 @@ internal static extern int RegSetValueEx(
             ref long lpData,
             int cbData);
 
-        [DllImport(Libraries.Advapi32, CharSet = CharSet.Unicode, BestFitMapping = false, EntryPoint = "RegSetValueExW")]
+        [DllImport(Libraries.Advapi32, CharSet = CharSet.Unicode, BestFitMapping = false, EntryPoint = "RegSetValueExW", ExactSpelling = true)]
         internal static extern int RegSetValueEx(
             SafeRegistryHandle hKey,
             string? lpValueName,
diff --git a/src/libraries/Common/src/Interop/Windows/Kernel32/Interop.EventWaitHandle.cs b/src/libraries/Common/src/Interop/Windows/Kernel32/Interop.EventWaitHandle.cs
index c3adfadb53d54..e4b0904b76ba1 100644
--- a/src/libraries/Common/src/Interop/Windows/Kernel32/Interop.EventWaitHandle.cs
+++ b/src/libraries/Common/src/Interop/Windows/Kernel32/Interop.EventWaitHandle.cs
@@ -20,10 +20,10 @@ internal static partial class Kernel32
         [DllImport(Libraries.Kernel32, SetLastError = true)]
         internal static extern bool ResetEvent(SafeWaitHandle handle);
 
-        [DllImport(Libraries.Kernel32, EntryPoint = "CreateEventExW", SetLastError = true, CharSet = CharSet.Unicode)]
+        [DllImport(Libraries.Kernel32, EntryPoint = "CreateEventExW", SetLastError = true, CharSet = CharSet.Unicode, ExactSpelling = true)]
         internal static extern SafeWaitHandle CreateEventEx(IntPtr lpSecurityAttributes, string? name, uint flags, uint desiredAccess);
 
-        [DllImport(Libraries.Kernel32, EntryPoint = "OpenEventW", SetLastError = true, CharSet = CharSet.Unicode)]
+        [DllImport(Libraries.Kernel32, EntryPoint = "OpenEventW", SetLastError = true, CharSet = CharSet.Unicode, ExactSpelling = true)]
         internal static extern SafeWaitHandle OpenEvent(uint desiredAccess, bool inheritHandle, string name);
     }
 }
diff --git a/src/libraries/Common/src/Interop/Windows/Kernel32/Interop.ExpandEnvironmentStrings.cs b/src/libraries/Common/src/Interop/Windows/Kernel32/Interop.ExpandEnvironmentStrings.cs
index fbd5da84b8e0a..94a3714644e12 100644
--- a/src/libraries/Common/src/Interop/Windows/Kernel32/Interop.ExpandEnvironmentStrings.cs
+++ b/src/libraries/Common/src/Interop/Windows/Kernel32/Interop.ExpandEnvironmentStrings.cs
@@ -8,7 +8,7 @@ internal static partial class Interop
 {
     internal static partial class Kernel32
     {
-        [DllImport(Libraries.Kernel32, EntryPoint = "ExpandEnvironmentStringsW", CharSet = CharSet.Unicode, SetLastError = true)]
+        [DllImport(Libraries.Kernel32, EntryPoint = "ExpandEnvironmentStringsW", CharSet = CharSet.Unicode, SetLastError = true, ExactSpelling = true)]
         internal static extern uint ExpandEnvironmentStrings(string lpSrc, ref char lpDst, uint nSize);
     }
 }
diff --git a/src/libraries/Common/src/Interop/Windows/Kernel32/Interop.FindFirstFileEx.cs b/src/libraries/Common/src/Interop/Windows/Kernel32/Interop.FindFirstFileEx.cs
index 6ab52b4d0e9e2..a7cd35262d50d 100644
--- a/src/libraries/Common/src/Interop/Windows/Kernel32/Interop.FindFirstFileEx.cs
+++ b/src/libraries/Common/src/Interop/Windows/Kernel32/Interop.FindFirstFileEx.cs
@@ -15,7 +15,7 @@ internal static partial class Kernel32
         /// <summary>
         /// WARNING: This method does not implicitly handle long paths. Use FindFirstFile.
         /// </summary>
-        [DllImport(Libraries.Kernel32, EntryPoint = "FindFirstFileExW", SetLastError = true, CharSet = CharSet.Unicode)]
+        [DllImport(Libraries.Kernel32, EntryPoint = "FindFirstFileExW", SetLastError = true, CharSet = CharSet.Unicode, ExactSpelling = true)]
         private static extern SafeFindHandle FindFirstFileExPrivate(string lpFileName, FINDEX_INFO_LEVELS fInfoLevelId, ref WIN32_FIND_DATA lpFindFileData, FINDEX_SEARCH_OPS fSearchOp, IntPtr lpSearchFilter, int dwAdditionalFlags);
 
         internal static SafeFindHandle FindFirstFile(string fileName, ref WIN32_FIND_DATA data)
diff --git a/src/libraries/Common/src/Interop/Windows/Kernel32/Interop.FormatMessage.cs b/src/libraries/Common/src/Interop/Windows/Kernel32/Interop.FormatMessage.cs
index 2eda58f250426..14ba39b044b9f 100644
--- a/src/libraries/Common/src/Interop/Windows/Kernel32/Interop.FormatMessage.cs
+++ b/src/libraries/Common/src/Interop/Windows/Kernel32/Interop.FormatMessage.cs
@@ -16,7 +16,7 @@ internal static partial class Kernel32
         private const int FORMAT_MESSAGE_ALLOCATE_BUFFER = 0x00000100;
         private const int ERROR_INSUFFICIENT_BUFFER = 0x7A;
 
-        [DllImport(Libraries.Kernel32, CharSet = CharSet.Unicode, EntryPoint = "FormatMessageW", SetLastError = true, BestFitMapping = true)]
+        [DllImport(Libraries.Kernel32, CharSet = CharSet.Unicode, EntryPoint = "FormatMessageW", SetLastError = true, BestFitMapping = true, ExactSpelling = true)]
         private static extern unsafe int FormatMessage(
             int dwFlags,
             IntPtr lpSource,
diff --git a/src/libraries/Common/src/Interop/Windows/Kernel32/Interop.FreeEnvironmentStrings.cs b/src/libraries/Common/src/Interop/Windows/Kernel32/Interop.FreeEnvironmentStrings.cs
index c222db8ef91b5..f325c281df8cf 100644
--- a/src/libraries/Common/src/Interop/Windows/Kernel32/Interop.FreeEnvironmentStrings.cs
+++ b/src/libraries/Common/src/Interop/Windows/Kernel32/Interop.FreeEnvironmentStrings.cs
@@ -8,7 +8,7 @@ internal static partial class Interop
 {
     internal static partial class Kernel32
     {
-        [DllImport(Libraries.Kernel32, EntryPoint = "FreeEnvironmentStringsW", SetLastError = true, CharSet = CharSet.Unicode, BestFitMapping = false)]
+        [DllImport(Libraries.Kernel32, EntryPoint = "FreeEnvironmentStringsW", SetLastError = true, CharSet = CharSet.Unicode, BestFitMapping = false, ExactSpelling = true)]
         internal static extern unsafe bool FreeEnvironmentStrings(char* lpszEnvironmentBlock);
     }
 }
diff --git a/src/libraries/Common/src/Interop/Windows/Kernel32/Interop.GetComputerName.cs b/src/libraries/Common/src/Interop/Windows/Kernel32/Interop.GetComputerName.cs
index 011430da5c7e8..92cfb955a4cba 100644
--- a/src/libraries/Common/src/Interop/Windows/Kernel32/Interop.GetComputerName.cs
+++ b/src/libraries/Common/src/Interop/Windows/Kernel32/Interop.GetComputerName.cs
@@ -10,7 +10,7 @@ internal static partial class Interop
 {
     internal static partial class Kernel32
     {
-        [DllImport(Libraries.Kernel32, CharSet = CharSet.Unicode, EntryPoint = "GetComputerNameW")]
+        [DllImport(Libraries.Kernel32, CharSet = CharSet.Unicode, EntryPoint = "GetComputerNameW", ExactSpelling = true)]
         private static extern unsafe int GetComputerName(ref char lpBuffer, ref uint nSize);
 
         // maximum length of the NETBIOS name (not including NULL)
diff --git a/src/libraries/Common/src/Interop/Windows/Kernel32/Interop.GetCurrentDirectory.cs b/src/libraries/Common/src/Interop/Windows/Kernel32/Interop.GetCurrentDirectory.cs
index 4e30a8be4328a..bf283df9c4046 100644
--- a/src/libraries/Common/src/Interop/Windows/Kernel32/Interop.GetCurrentDirectory.cs
+++ b/src/libraries/Common/src/Interop/Windows/Kernel32/Interop.GetCurrentDirectory.cs
@@ -8,7 +8,7 @@ internal static partial class Interop
 {
     internal static partial class Kernel32
     {
-        [DllImport(Libraries.Kernel32, EntryPoint = "GetCurrentDirectoryW", SetLastError = true, CharSet = CharSet.Unicode, BestFitMapping = false)]
+        [DllImport(Libraries.Kernel32, EntryPoint = "GetCurrentDirectoryW", SetLastError = true, CharSet = CharSet.Unicode, BestFitMapping = false, ExactSpelling = true)]
         internal static extern uint GetCurrentDirectory(uint nBufferLength, ref char lpBuffer);
     }
 }
diff --git a/src/libraries/Common/src/Interop/Windows/Kernel32/Interop.GetEnvironmentStrings.cs b/src/libraries/Common/src/Interop/Windows/Kernel32/Interop.GetEnvironmentStrings.cs
index 5594fe7a4cb8e..cdbd01ca50208 100644
--- a/src/libraries/Common/src/Interop/Windows/Kernel32/Interop.GetEnvironmentStrings.cs
+++ b/src/libraries/Common/src/Interop/Windows/Kernel32/Interop.GetEnvironmentStrings.cs
@@ -8,7 +8,7 @@ internal static partial class Interop
 {
     internal static partial class Kernel32
     {
-        [DllImport(Libraries.Kernel32, EntryPoint = "GetEnvironmentStringsW", SetLastError = true, CharSet = CharSet.Unicode, BestFitMapping = false)]
+        [DllImport(Libraries.Kernel32, EntryPoint = "GetEnvironmentStringsW", SetLastError = true, CharSet = CharSet.Unicode, BestFitMapping = false, ExactSpelling = true)]
         internal static extern unsafe char* GetEnvironmentStrings();
     }
 }
diff --git a/src/libraries/Common/src/Interop/Windows/Kernel32/Interop.GetEnvironmentVariable.cs b/src/libraries/Common/src/Interop/Windows/Kernel32/Interop.GetEnvironmentVariable.cs
index 43463e52304cb..0c14b3dd40398 100644
--- a/src/libraries/Common/src/Interop/Windows/Kernel32/Interop.GetEnvironmentVariable.cs
+++ b/src/libraries/Common/src/Interop/Windows/Kernel32/Interop.GetEnvironmentVariable.cs
@@ -17,7 +17,7 @@ internal static unsafe int GetEnvironmentVariable(string lpName, Span<char> buff
             }
         }
 
-        [DllImport(Libraries.Kernel32, EntryPoint = "GetEnvironmentVariableW", SetLastError = true, CharSet = CharSet.Unicode)]
+        [DllImport(Libraries.Kernel32, EntryPoint = "GetEnvironmentVariableW", SetLastError = true, CharSet = CharSet.Unicode, ExactSpelling = true)]
         private static extern unsafe int GetEnvironmentVariable(string lpName, char* lpBuffer, int nSize);
     }
 }
diff --git a/src/libraries/Common/src/Interop/Windows/Kernel32/Interop.GetFileAttributesEx.cs b/src/libraries/Common/src/Interop/Windows/Kernel32/Interop.GetFileAttributesEx.cs
index aed8919cd03e9..84cd7326b39fe 100644
--- a/src/libraries/Common/src/Interop/Windows/Kernel32/Interop.GetFileAttributesEx.cs
+++ b/src/libraries/Common/src/Interop/Windows/Kernel32/Interop.GetFileAttributesEx.cs
@@ -13,7 +13,7 @@ internal static partial class Kernel32
         /// <summary>
         /// WARNING: This method does not implicitly handle long paths. Use GetFileAttributesEx.
         /// </summary>
-        [DllImport(Libraries.Kernel32, EntryPoint = "GetFileAttributesExW", SetLastError = true, CharSet = CharSet.Unicode)]
+        [DllImport(Libraries.Kernel32, EntryPoint = "GetFileAttributesExW", SetLastError = true, CharSet = CharSet.Unicode, ExactSpelling = true)]
         private static extern bool GetFileAttributesExPrivate(string? name, GET_FILEEX_INFO_LEVELS fileInfoLevel, ref WIN32_FILE_ATTRIBUTE_DATA lpFileInformation);
 
         internal static bool GetFileAttributesEx(string? name, GET_FILEEX_INFO_LEVELS fileInfoLevel, ref WIN32_FILE_ATTRIBUTE_DATA lpFileInformation)
diff --git a/src/libraries/Common/src/Interop/Windows/Kernel32/Interop.GetSystemDirectoryW.cs b/src/libraries/Common/src/Interop/Windows/Kernel32/Interop.GetSystemDirectoryW.cs
index 197f6f5eadcdb..b247a509c40d8 100644
--- a/src/libraries/Common/src/Interop/Windows/Kernel32/Interop.GetSystemDirectoryW.cs
+++ b/src/libraries/Common/src/Interop/Windows/Kernel32/Interop.GetSystemDirectoryW.cs
@@ -8,7 +8,7 @@ internal static partial class Interop
 {
     internal static partial class Kernel32
     {
-        [DllImport(Libraries.Kernel32, CharSet = CharSet.Unicode, SetLastError = true)]
+        [DllImport(Libraries.Kernel32, CharSet = CharSet.Unicode, SetLastError = true, ExactSpelling = true)]
         internal static extern uint GetSystemDirectoryW(ref char lpBuffer, uint uSize);
     }
 }
diff --git a/src/libraries/Common/src/Interop/Windows/Kernel32/Interop.GetTempFileNameW.cs b/src/libraries/Common/src/Interop/Windows/Kernel32/Interop.GetTempFileNameW.cs
index d7f9b828c0c03..5c3140b82ea66 100644
--- a/src/libraries/Common/src/Interop/Windows/Kernel32/Interop.GetTempFileNameW.cs
+++ b/src/libraries/Common/src/Interop/Windows/Kernel32/Interop.GetTempFileNameW.cs
@@ -8,7 +8,7 @@ internal static partial class Interop
 {
     internal static partial class Kernel32
     {
-        [DllImport(Libraries.Kernel32, CharSet = CharSet.Unicode, SetLastError = true, BestFitMapping = false)]
+        [DllImport(Libraries.Kernel32, CharSet = CharSet.Unicode, SetLastError = true, BestFitMapping = false, ExactSpelling = true)]
         internal static extern uint GetTempFileNameW(ref char lpPathName, string lpPrefixString, uint uUnique, ref char lpTempFileName);
     }
 }
diff --git a/src/libraries/Common/src/Interop/Windows/Kernel32/Interop.GetTempPathW.cs b/src/libraries/Common/src/Interop/Windows/Kernel32/Interop.GetTempPathW.cs
index 8d2b0b199edd0..654a3b57011cd 100644
--- a/src/libraries/Common/src/Interop/Windows/Kernel32/Interop.GetTempPathW.cs
+++ b/src/libraries/Common/src/Interop/Windows/Kernel32/Interop.GetTempPathW.cs
@@ -8,7 +8,7 @@ internal static partial class Interop
 {
     internal static partial class Kernel32
     {
-        [DllImport(Libraries.Kernel32, CharSet = CharSet.Unicode, BestFitMapping = false)]
+        [DllImport(Libraries.Kernel32, CharSet = CharSet.Unicode, BestFitMapping = false, ExactSpelling = true)]
         internal static extern uint GetTempPathW(int bufferLen, ref char buffer);
     }
 }
diff --git a/src/libraries/Common/src/Interop/Windows/Kernel32/Interop.LoadLibraryEx_IntPtr.cs b/src/libraries/Common/src/Interop/Windows/Kernel32/Interop.LoadLibraryEx_IntPtr.cs
index a77cf49179382..3e3d1d34a81a7 100644
--- a/src/libraries/Common/src/Interop/Windows/Kernel32/Interop.LoadLibraryEx_IntPtr.cs
+++ b/src/libraries/Common/src/Interop/Windows/Kernel32/Interop.LoadLibraryEx_IntPtr.cs
@@ -12,7 +12,7 @@ internal static partial class Kernel32
         internal const int LOAD_LIBRARY_AS_DATAFILE = 0x00000002;
         internal const int LOAD_LIBRARY_SEARCH_SYSTEM32 = 0x00000800;
 
-        [DllImport(Libraries.Kernel32, CharSet = CharSet.Unicode, EntryPoint = "LoadLibraryExW", SetLastError = true)]
+        [DllImport(Libraries.Kernel32, CharSet = CharSet.Unicode, EntryPoint = "LoadLibraryExW", SetLastError = true, ExactSpelling = true)]
         internal static extern IntPtr LoadLibraryEx(string libFilename, IntPtr reserved, int flags);
     }
 }
diff --git a/src/libraries/Common/src/Interop/Windows/Kernel32/Interop.Mutex.cs b/src/libraries/Common/src/Interop/Windows/Kernel32/Interop.Mutex.cs
index 6adaf98737040..ad1d649fe9da8 100644
--- a/src/libraries/Common/src/Interop/Windows/Kernel32/Interop.Mutex.cs
+++ b/src/libraries/Common/src/Interop/Windows/Kernel32/Interop.Mutex.cs
@@ -13,10 +13,10 @@ internal static partial class Kernel32
     {
         internal const uint CREATE_MUTEX_INITIAL_OWNER = 0x1;
 
-        [DllImport(Libraries.Kernel32, EntryPoint = "OpenMutexW", SetLastError = true, CharSet = CharSet.Unicode)]
+        [DllImport(Libraries.Kernel32, EntryPoint = "OpenMutexW", SetLastError = true, CharSet = CharSet.Unicode, ExactSpelling = true)]
         internal static extern SafeWaitHandle OpenMutex(uint desiredAccess, bool inheritHandle, string name);
 
-        [DllImport(Libraries.Kernel32, EntryPoint = "CreateMutexExW", SetLastError = true, CharSet = CharSet.Unicode)]
+        [DllImport(Libraries.Kernel32, EntryPoint = "CreateMutexExW", SetLastError = true, CharSet = CharSet.Unicode, ExactSpelling = true)]
         internal static extern SafeWaitHandle CreateMutexEx(IntPtr lpMutexAttributes, string? name, uint flags, uint desiredAccess);
 
         [DllImport(Libraries.Kernel32, SetLastError = true)]
diff --git a/src/libraries/Common/src/Interop/Windows/Kernel32/Interop.Semaphore.cs b/src/libraries/Common/src/Interop/Windows/Kernel32/Interop.Semaphore.cs
index 4f6d8de8768a3..c83db1f934c00 100644
--- a/src/libraries/Common/src/Interop/Windows/Kernel32/Interop.Semaphore.cs
+++ b/src/libraries/Common/src/Interop/Windows/Kernel32/Interop.Semaphore.cs
@@ -11,10 +11,10 @@ internal static partial class Interop
 {
     internal static partial class Kernel32
     {
-        [DllImport(Libraries.Kernel32, EntryPoint = "OpenSemaphoreW", SetLastError = true, CharSet = CharSet.Unicode)]
+        [DllImport(Libraries.Kernel32, EntryPoint = "OpenSemaphoreW", SetLastError = true, CharSet = CharSet.Unicode, ExactSpelling = true)]
         internal static extern SafeWaitHandle OpenSemaphore(uint desiredAccess, bool inheritHandle, string name);
 
-        [DllImport(Libraries.Kernel32, EntryPoint = "CreateSemaphoreExW", SetLastError = true, CharSet = CharSet.Unicode)]
+        [DllImport(Libraries.Kernel32, EntryPoint = "CreateSemaphoreExW", SetLastError = true, CharSet = CharSet.Unicode, ExactSpelling = true)]
         internal static extern SafeWaitHandle CreateSemaphoreEx(IntPtr lpSecurityAttributes, int initialCount, int maximumCount, string? name, uint flags, uint desiredAccess);
 
         [DllImport(Libraries.Kernel32, SetLastError = true)]
diff --git a/src/libraries/Common/src/Interop/Windows/Kernel32/Interop.SetCurrentDirectory.cs b/src/libraries/Common/src/Interop/Windows/Kernel32/Interop.SetCurrentDirectory.cs
index d268d4daa6f77..17360399a7c0d 100644
--- a/src/libraries/Common/src/Interop/Windows/Kernel32/Interop.SetCurrentDirectory.cs
+++ b/src/libraries/Common/src/Interop/Windows/Kernel32/Interop.SetCurrentDirectory.cs
@@ -8,7 +8,7 @@ internal static partial class Interop
 {
     internal static partial class Kernel32
     {
-        [DllImport(Libraries.Kernel32, EntryPoint = "SetCurrentDirectoryW", SetLastError = true, CharSet = CharSet.Unicode, BestFitMapping = false)]
+        [DllImport(Libraries.Kernel32, EntryPoint = "SetCurrentDirectoryW", SetLastError = true, CharSet = CharSet.Unicode, BestFitMapping = false, ExactSpelling = true)]
         internal static extern bool SetCurrentDirectory(string path);
     }
 }
diff --git a/src/libraries/Common/src/Interop/Windows/Kernel32/Interop.SetEnvironmentVariable.cs b/src/libraries/Common/src/Interop/Windows/Kernel32/Interop.SetEnvironmentVariable.cs
index 243bd6562e034..ab3a6d34cd42b 100644
--- a/src/libraries/Common/src/Interop/Windows/Kernel32/Interop.SetEnvironmentVariable.cs
+++ b/src/libraries/Common/src/Interop/Windows/Kernel32/Interop.SetEnvironmentVariable.cs
@@ -8,7 +8,7 @@ internal static partial class Interop
 {
     internal static partial class Kernel32
     {
-        [DllImport(Libraries.Kernel32, EntryPoint = "SetEnvironmentVariableW", SetLastError = true, CharSet = CharSet.Unicode, BestFitMapping = false)]
+        [DllImport(Libraries.Kernel32, EntryPoint = "SetEnvironmentVariableW", SetLastError = true, CharSet = CharSet.Unicode, BestFitMapping = false, ExactSpelling = true)]
         internal static extern bool SetEnvironmentVariable(string lpName, string? lpValue);
     }
 }
diff --git a/src/libraries/Common/src/Interop/Windows/Secur32/Interop.GetUserNameExW.cs b/src/libraries/Common/src/Interop/Windows/Secur32/Interop.GetUserNameExW.cs
index e88864cd9e747..7001cd6df09ea 100644
--- a/src/libraries/Common/src/Interop/Windows/Secur32/Interop.GetUserNameExW.cs
+++ b/src/libraries/Common/src/Interop/Windows/Secur32/Interop.GetUserNameExW.cs
@@ -8,7 +8,7 @@ internal static partial class Interop
 {
     internal static partial class Secur32
     {
-        [DllImport(Libraries.Secur32, CharSet = CharSet.Unicode, SetLastError = true)]
+        [DllImport(Libraries.Secur32, CharSet = CharSet.Unicode, SetLastError = true, ExactSpelling = true)]
         internal static extern BOOLEAN GetUserNameExW(int NameFormat, ref char lpNameBuffer, ref uint lpnSize);
 
         internal const int NameSamCompatible = 2;
diff --git a/src/libraries/Common/src/Interop/Windows/User32/Interop.LoadString.cs b/src/libraries/Common/src/Interop/Windows/User32/Interop.LoadString.cs
index 6ff50442eb428..8824f7c3dfa02 100644
--- a/src/libraries/Common/src/Interop/Windows/User32/Interop.LoadString.cs
+++ b/src/libraries/Common/src/Interop/Windows/User32/Interop.LoadString.cs
@@ -9,7 +9,7 @@ internal static partial class Interop
 {
     internal static partial class User32
     {
-        [DllImport(Libraries.User32, SetLastError = true, EntryPoint = "LoadStringW", CharSet = CharSet.Unicode)]
+        [DllImport(Libraries.User32, SetLastError = true, EntryPoint = "LoadStringW", CharSet = CharSet.Unicode, ExactSpelling = true)]
         internal static extern unsafe int LoadString(IntPtr hInstance, uint uID, char* lpBuffer, int cchBufferMax);
     }
 }