diff --git a/atl.vcxproj b/atl.vcxproj
index a8d6020..a6bf798 100644
--- a/atl.vcxproj
+++ b/atl.vcxproj
@@ -107,6 +107,7 @@
     <ClInclude Include="atleap.h" />
     <ClInclude Include="atlex.h" />
     <ClInclude Include="atlmsi.h" />
+    <ClInclude Include="atlsec.h" />
     <ClInclude Include="atlshlwapi.h" />
     <ClInclude Include="atlwin.h" />
     <ClInclude Include="atlwlan.h" />
diff --git a/atl.vcxproj.filters b/atl.vcxproj.filters
index 98c6f2d..f305a55 100644
--- a/atl.vcxproj.filters
+++ b/atl.vcxproj.filters
@@ -40,5 +40,8 @@
     <ClInclude Include="atleap.h">
       <Filter>Header Files</Filter>
     </ClInclude>
+    <ClInclude Include="atlsec.h">
+      <Filter>Header Files</Filter>
+    </ClInclude>
   </ItemGroup>
 </Project>
\ No newline at end of file
diff --git a/atlsec.h b/atlsec.h
new file mode 100644
index 0000000..78a1e9d
--- /dev/null
+++ b/atlsec.h
@@ -0,0 +1,84 @@
+/*
+    Copyright 1991-2015 Amebis
+
+    This file is part of libatl.
+
+    Setup is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    Setup is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with Setup. If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#include <Security.h>
+
+
+BOOLEAN GetUserNameExA(__in EXTENDED_NAME_FORMAT NameFormat, __out ATL::CAtlStringA &sName)
+{
+    ULONG ulSize = 0;
+
+    // Query the final string length first.
+    if (!::GetUserNameExA(NameFormat, NULL, &ulSize)) {
+        if (::GetLastError() == ERROR_MORE_DATA) {
+            // Prepare the buffer and retry.
+            LPSTR szBuffer = sName.GetBuffer(ulSize - 1);
+            if (!szBuffer) {
+                SetLastError(ERROR_OUTOFMEMORY);
+                return FALSE;
+            }
+            if (::GetUserNameExA(NameFormat, szBuffer, &ulSize)) {
+                sName.ReleaseBuffer(ulSize);
+                return TRUE;
+            } else {
+                sName.ReleaseBuffer(0);
+                return FALSE;
+            }
+        } else {
+            // Return error.
+            return FALSE;
+        }
+    } else {
+        // The result is empty.
+        sName.Empty();
+        return NO_ERROR;
+    }
+}
+
+
+BOOLEAN GetUserNameExW(__in EXTENDED_NAME_FORMAT NameFormat, __out ATL::CAtlStringW &sName)
+{
+    ULONG ulSize = 0;
+
+    // Query the final string length first.
+    if (!::GetUserNameExW(NameFormat, NULL, &ulSize)) {
+        if (::GetLastError() == ERROR_MORE_DATA) {
+            // Prepare the buffer and retry.
+            LPWSTR szBuffer = sName.GetBuffer(ulSize - 1);
+            if (!szBuffer) {
+                SetLastError(ERROR_OUTOFMEMORY);
+                return FALSE;
+            }
+            if (::GetUserNameExW(NameFormat, szBuffer, &ulSize)) {
+                sName.ReleaseBuffer(ulSize);
+                return TRUE;
+            } else {
+                sName.ReleaseBuffer(0);
+                return FALSE;
+            }
+        } else {
+            // Return error.
+            return FALSE;
+        }
+    } else {
+        // The result is empty.
+        sName.Empty();
+        return NO_ERROR;
+    }
+}
diff --git a/atlshlwapi.h b/atlshlwapi.h
index 76f9035..4b4dcfa 100644
--- a/atlshlwapi.h
+++ b/atlshlwapi.h
@@ -32,7 +32,7 @@ inline BOOL PathCanonicalizeA(__out ATL::CAtlStringA &sValue, __in LPCSTR pszPat
         return FALSE;
     }
     BOOL bResult = ::PathCanonicalizeA(szBuffer, pszPath);
-    sValue.ReleaseBuffer(bResult ? strnlen(szBuffer, MAX_PATH) : 0);
+    sValue.ReleaseBuffer(bResult ? (int)strnlen(szBuffer, MAX_PATH) : 0);
     sValue.FreeExtra();
     return bResult;
 }
@@ -47,7 +47,7 @@ inline BOOL PathCanonicalizeW(__out ATL::CAtlStringW &sValue, __in LPCWSTR pszPa
         return FALSE;
     }
     BOOL bResult = ::PathCanonicalizeW(szBuffer, pszPath);
-    sValue.ReleaseBuffer(bResult ? wcsnlen(szBuffer, MAX_PATH) : 0);
+    sValue.ReleaseBuffer(bResult ? (int)wcsnlen(szBuffer, MAX_PATH) : 0);
     sValue.FreeExtra();
     return bResult;
 }
diff --git a/stdafx.h b/stdafx.h
index f2ab7f7..99c70cc 100644
--- a/stdafx.h
+++ b/stdafx.h
@@ -22,4 +22,12 @@
 #include "atlwin.h"
 
 #include "atlcrypt.h"
+#include "atleap.h"
+#include "atlex.h"
 #include "atlmsi.h"
+#if defined(SECURITY_WIN32) || defined(SECURITY_KERNEL) || defined(SECURITY_MAC)
+#include "atlsec.h"
+#endif
+#include "atlshlwapi.h"
+#include "atlwin.h"
+#include "atlwlan.h"