External Registry loader should read from 32-bit HKLM registry hive

chrome/browser/extensions/external_registry_loader_win.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/extensions/external_registry_loader_win.h"
 
 #include "base/bind.h"
 #include "base/files/file_path.h"
 #include "base/files/file_util.h"
 #include "base/files/scoped_file.h"
@@ skipping 68 matching lines @@
   // Iterate over the keys found, first trying HKLM, then HKCU, as per Windows
   // policy conventions. We only fall back to HKCU if the HKLM key cannot be
   // opened, not if the data within the key is invalid, for example.
   for (std::set<base::string16>::const_iterator it = keys.begin();
        it != keys.end(); ++it) {
     base::win::RegKey key;
     base::string16 key_path = base::ASCIIToWide(kRegistryExtensions);
     key_path.append(L"\\");
     key_path.append(*it);
     if (key.Open(HKEY_LOCAL_MACHINE,
-                 key_path.c_str(), KEY_READ) != ERROR_SUCCESS) {
+                 key_path.c_str(),
+                 KEY_READ | KEY_WOW64_32KEY) != ERROR_SUCCESS) {
       if (key.Open(HKEY_CURRENT_USER,
                    key_path.c_str(), KEY_READ) != ERROR_SUCCESS) {
         LOG(ERROR) << "Unable to read registry key at path (HKLM & HKCU): "
                    << key_path << ".";
         continue;
       }
     }
 
     std::string id = base::UTF16ToASCII(*it);
     base::StringToLowerASCII(&id);
@@ skipping 82 matching lines @@
 
   prefs_.reset(prefs.release());
   LOCAL_HISTOGRAM_TIMES("Extensions.ExternalRegistryLoaderWin",
                         base::TimeTicks::Now() - start_time);
   BrowserThread::PostTask(
       BrowserThread::UI, FROM_HERE,
       base::Bind(&ExternalRegistryLoader::LoadFinished, this));
 }
 
 }  // namespace extensions