Fix auto-opening file types not auto-opening....

chrome/browser/download/download_manager.cc

 // Copyright (c) 2006-2009 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/download/download_manager.h"
 
 #include "app/l10n_util.h"
 #include "base/file_util.h"
 #include "base/logging.h"
 #include "base/message_loop.h"
@@ skipping 815 matching lines @@
   // If this was a dangerous download, it has now been approved and must be
   // removed from dangerous_finished_ so it does not get deleted on shutdown.
   DownloadMap::iterator it = dangerous_finished_.find(download->id());
   if (it != dangerous_finished_.end())
     dangerous_finished_.erase(it);
 
   // Notify our observers that we are complete (the call to Finished() set the
   // state to complete but did not notify).
   download->UpdateObservers();
 
-  // Open the download if the user or user prefs indicate it should be.
-  FilePath::StringType extension = download->full_path().Extension();
-
   // Handle chrome extensions explicitly and skip the shell execute.
   if (Extension::IsExtension(download->full_path())) {
     OpenChromeExtension(download->full_path());
     return;
   }
 
+  // Open the download if the user or user prefs indicate it should be.
+  FilePath::StringType extension = download->full_path().Extension();
+  // Drop the leading period. (The auto-open list is period-less.)
+  if (extension.size() > 0)
+    extension = extension.substr(1);
+
   if (download->open_when_complete() || ShouldOpenFileExtension(extension))
     OpenDownloadInShell(download, NULL);
 }
 
 // Called on the file thread.  Renames the downloaded file to its original name.
 void DownloadManager::ProceedWithFinishedDangerousDownload(
     int64 download_handle,
     const FilePath& path,
     const FilePath& original_name) {
   bool success = false;
@@ skipping 625 matching lines @@
   }
 
   if (contents)
     contents->OnStartDownload(download);
 }
 
 // Clears the last download path, used to initialize "save as" dialogs.
 void DownloadManager::ClearLastDownloadPath() {
   last_download_path_ = FilePath();
 }