diff --git a/Source/cmSystemTools.cxx b/Source/cmSystemTools.cxx
index 6da20fb1d..4e1f9453e 100644
--- a/Source/cmSystemTools.cxx
+++ b/Source/cmSystemTools.cxx
@@ -130,7 +130,7 @@ void* cmSystemTools::s_StdoutCallbackClientData = 0;
 // replace replace with with as many times as it shows up in source.
 // write the result into source.
 #if defined(_WIN32) && !defined(__CYGWIN__)
-void cmSystemTools::ExpandRegistryValues(std::string& source)
+void cmSystemTools::ExpandRegistryValues(std::string& source, KeyWOW64 view)
 {
   // Regular expression to match anything inside [...] that begins in HKEY.
   // Note that there is a special rule for regular expressions to match a
@@ -146,7 +146,7 @@ void cmSystemTools::ExpandRegistryValues(std::string& source)
     // the arguments are the second match
     std::string key = regEntry.match(1);
     std::string val;
-    if (ReadRegistryValue(key.c_str(), val))
+    if (ReadRegistryValue(key.c_str(), val, view))
       {
       std::string reg = "[";
       reg += key + "]";
@@ -161,7 +161,7 @@ void cmSystemTools::ExpandRegistryValues(std::string& source)
     }
 }
 #else
-void cmSystemTools::ExpandRegistryValues(std::string& source)
+void cmSystemTools::ExpandRegistryValues(std::string& source, KeyWOW64)
 {
   cmsys::RegularExpression regEntry("\\[(HKEY[^]]*)\\]");
   while (regEntry.find(source))
diff --git a/Source/cmSystemTools.h b/Source/cmSystemTools.h
index 77b79839f..493ff714d 100644
--- a/Source/cmSystemTools.h
+++ b/Source/cmSystemTools.h
@@ -48,7 +48,8 @@ public:
   /**
    * Look for and replace registry values in a string
    */
-  static void ExpandRegistryValues(std::string& source);
+  static void ExpandRegistryValues(std::string& source,
+                                   KeyWOW64 view = KeyWOW64_Default);
 
   /**
    * Platform independent escape spaces, unix uses backslash,
diff --git a/Source/kwsys/SystemTools.cxx b/Source/kwsys/SystemTools.cxx
index d5d530de9..1277d71a4 100644
--- a/Source/kwsys/SystemTools.cxx
+++ b/Source/kwsys/SystemTools.cxx
@@ -493,6 +493,30 @@ void SystemTools::ReplaceString(kwsys_stl::string& source,
   free(orig);
 }
 
+#if defined(KEY_WOW64_32KEY) && defined(KEY_WOW64_64KEY)
+# define KWSYS_ST_KEY_WOW64_32KEY KEY_WOW64_32KEY
+# define KWSYS_ST_KEY_WOW64_64KEY KEY_WOW64_64KEY
+#else
+# define KWSYS_ST_KEY_WOW64_32KEY 0x0200
+# define KWSYS_ST_KEY_WOW64_64KEY 0x0100
+#endif
+
+#if defined(_WIN32) && !defined(__CYGWIN__)
+static DWORD SystemToolsMakeRegistryMode(DWORD mode,
+                                         SystemTools::KeyWOW64 view)
+{
+  if(view == SystemTools::KeyWOW64_32)
+    {
+    return mode | KWSYS_ST_KEY_WOW64_32KEY;
+    }
+  else if(view == SystemTools::KeyWOW64_64)
+    {
+    return mode | KWSYS_ST_KEY_WOW64_64KEY;
+    }
+  return mode;
+}
+#endif
+
 // Read a registry value.
 // Example : 
 //      HKEY_LOCAL_MACHINE\SOFTWARE\Python\PythonCore\2.1\InstallPath
@@ -501,7 +525,8 @@ void SystemTools::ReplaceString(kwsys_stl::string& source,
 //      =>  will return the data of the "Root" value of the key
 
 #if defined(_WIN32) && !defined(__CYGWIN__)
-bool SystemTools::ReadRegistryValue(const char *key, kwsys_stl::string &value)
+bool SystemTools::ReadRegistryValue(const char *key, kwsys_stl::string &value,
+                                    KeyWOW64 view)
 {
   bool valueset = false;
   kwsys_stl::string primary = key;
@@ -549,7 +574,7 @@ bool SystemTools::ReadRegistryValue(const char *key, kwsys_stl::string &value)
   if(RegOpenKeyEx(primaryKey, 
                   second.c_str(), 
                   0, 
-                  KEY_READ, 
+                  SystemToolsMakeRegistryMode(KEY_READ, view),
                   &hKey) != ERROR_SUCCESS)
     {
     return false;
@@ -589,7 +614,8 @@ bool SystemTools::ReadRegistryValue(const char *key, kwsys_stl::string &value)
   return valueset;
 }
 #else
-bool SystemTools::ReadRegistryValue(const char *, kwsys_stl::string &)
+bool SystemTools::ReadRegistryValue(const char *, kwsys_stl::string &,
+                                    KeyWOW64)
 {
   return false;
 }
@@ -604,7 +630,8 @@ bool SystemTools::ReadRegistryValue(const char *, kwsys_stl::string &)
 //      =>  will set the data of the "Root" value of the key
 
 #if defined(_WIN32) && !defined(__CYGWIN__)
-bool SystemTools::WriteRegistryValue(const char *key, const char *value)
+bool SystemTools::WriteRegistryValue(const char *key, const char *value,
+                                     KeyWOW64 view)
 {
   kwsys_stl::string primary = key;
   kwsys_stl::string second;
@@ -654,7 +681,7 @@ bool SystemTools::WriteRegistryValue(const char *key, const char *value)
                     0, 
                     "",
                     REG_OPTION_NON_VOLATILE,
-                    KEY_WRITE,
+                    SystemToolsMakeRegistryMode(KEY_WRITE, view),
                     NULL,
                     &hKey,
                     &dwDummy) != ERROR_SUCCESS)
@@ -674,7 +701,7 @@ bool SystemTools::WriteRegistryValue(const char *key, const char *value)
   return false;
 }
 #else
-bool SystemTools::WriteRegistryValue(const char *, const char *)
+bool SystemTools::WriteRegistryValue(const char *, const char *, KeyWOW64)
 {
   return false;
 }
@@ -688,7 +715,7 @@ bool SystemTools::WriteRegistryValue(const char *, const char *)
 //      =>  will delete  the data of the "Root" value of the key
 
 #if defined(_WIN32) && !defined(__CYGWIN__)
-bool SystemTools::DeleteRegistryValue(const char *key)
+bool SystemTools::DeleteRegistryValue(const char *key, KeyWOW64 view)
 {
   kwsys_stl::string primary = key;
   kwsys_stl::string second;
@@ -735,7 +762,7 @@ bool SystemTools::DeleteRegistryValue(const char *key)
   if(RegOpenKeyEx(primaryKey, 
                   second.c_str(), 
                   0, 
-                  KEY_WRITE, 
+                  SystemToolsMakeRegistryMode(KEY_WRITE, view),
                   &hKey) != ERROR_SUCCESS)
     {
     return false;
@@ -752,7 +779,7 @@ bool SystemTools::DeleteRegistryValue(const char *key)
   return false;
 }
 #else
-bool SystemTools::DeleteRegistryValue(const char *)
+bool SystemTools::DeleteRegistryValue(const char *, KeyWOW64)
 {
   return false;
 }
diff --git a/Source/kwsys/SystemTools.hxx.in b/Source/kwsys/SystemTools.hxx.in
index 29f451c9c..1484b60b7 100644
--- a/Source/kwsys/SystemTools.hxx.in
+++ b/Source/kwsys/SystemTools.hxx.in
@@ -707,20 +707,30 @@ public:
    *  -----------------------------------------------------------------
    */
 
+  /**
+   * Specify access to the 32-bit or 64-bit application view of
+   * registry values.  The default is to match the currently running
+   * binary type.
+   */
+  enum KeyWOW64 { KeyWOW64_Default, KeyWOW64_32, KeyWOW64_64 };
+
   /**
    * Read a registry value
    */
-  static bool ReadRegistryValue(const char *key, kwsys_stl::string &value);
+  static bool ReadRegistryValue(const char *key, kwsys_stl::string &value,
+                                KeyWOW64 view = KeyWOW64_Default);
 
   /**
    * Write a registry value
    */
-  static bool WriteRegistryValue(const char *key, const char *value);
+  static bool WriteRegistryValue(const char *key, const char *value,
+                                 KeyWOW64 view = KeyWOW64_Default);
 
   /**
    * Delete a registry value
    */
-  static bool DeleteRegistryValue(const char *key);
+  static bool DeleteRegistryValue(const char *key,
+                                  KeyWOW64 view = KeyWOW64_Default);
 
   /** -----------------------------------------------------------------
    *               Environment Manipulation Routines