Improve the default browser settings dialog for Win10

chrome/installer/util/shell_util.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.
 //
 // This file defines functions that integrate Chrome in Windows shell. These
 // functions can be used by Chrome as well as Chrome installer. All of the
 // work is done by the local functions defined in anonymous namespace in
 // this class.
 
 #include "chrome/installer/util/shell_util.h"
@@ skipping 858 matching lines @@
     }
 
     DWORD ret_val = 0;
     InstallUtil::ExecuteExeAsAdmin(cmd, &ret_val);
     if (ret_val == 0)
       return true;
   }
   return false;
 }
 
+// Launches the Windows 'settings' modern app with the 'default apps' view
+// focused. This only works for Windows 8 and and. The appModelId
+// looks arbitrary but it is the same in Win8 and Win10 previews. There
+// is no easy way to retrieve the appModelId from the registry.
+bool LaunchDefaultAppsSettingsModernDialog() {
+  base::win::ScopedComPtr<IApplicationActivationManager> activator;

[Will Harris, 2015/05/16 05:04:02]

msdn says this needs shobjidl.h included

+  HRESULT hr = activator.CreateInstance(CLSID_ApplicationActivationManager);
+  if (SUCCEEDED(hr)) {
+    DWORD pid = 0;
+    CoAllowSetForegroundWindow(activator.get(), nullptr);
+    hr = activator->ActivateApplication(
+        L"windows.immersivecontrolpanel_cw5n1h2txyewy"
+        L"!microsoft.windows.immersivecontrolpanel",
+        L"page=SettingsPageAppsDefaults", AO_NONE, &pid);
+    return SUCCEEDED(hr);
+  }
+  return false;
+}
+
 // Launches the Windows 7 and Windows 8 dialog for picking the application to
 // handle the given protocol. Most importantly, this is used to set the default
 // handler for http (and, implicitly with it, https). In that case it is also
 // known as the 'how do you want to open webpages' dialog.
 // It is required that Chrome be already *registered* for the given protocol.
 bool LaunchSelectDefaultProtocolHandlerDialog(const wchar_t* protocol) {
   DCHECK(protocol);
   OPENASINFO open_as_info = {};
   open_as_info.pcszFile = protocol;
   open_as_info.oaifInFlags =
@@ skipping 1165 matching lines @@
       BrowserDistribution::DEFAULT_BROWSER_FULL_CONTROL) {
     return false;
   }
 
   if (!RegisterChromeBrowser(dist, chrome_exe, base::string16(), true))
       return false;
 
   bool succeeded = true;
   bool is_default = (GetChromeDefaultState() == IS_DEFAULT);
   if (!is_default) {
-    // On Windows 8, you can't set yourself as the default handler
-    // programatically. In other words IApplicationAssociationRegistration
-    // has been rendered useless. What you can do is to launch
-    // "Set Program Associations" section of the "Default Programs"
-    // control panel, which is a mess, or pop the concise "How you want to open
-    // webpages?" dialog.  We choose the latter.
-    succeeded = LaunchSelectDefaultProtocolHandlerDialog(L"http");
+    if (base::win::GetVersion() < base::win::VERSION_WIN10) {
+      // On Windows 8, you can't set yourself as the default handler
+      // programatically. In other words IApplicationAssociationRegistration
+      // has been rendered useless. What you can do is to launch
+      // "Set Program Associations" section of the "Default Programs"
+      // control panel, which is a mess, or pop the concise "How you want to
+      // open webpages?" dialog.  We choose the latter.
+      succeeded = LaunchSelectDefaultProtocolHandlerDialog(L"http");
+    } else {
+      // On Windows 10, you can't even launch the associations dialog.
+      // So we launch the settings dialog. Quoting from MSDN: "The Open With
+      // dialog box can no longer be used to change the default program used to
+      // open a file extension. You can only use SHOpenWithDialog to open
+      // a single file."
+      succeeded = LaunchDefaultAppsSettingsModernDialog();
+    }
     is_default = (succeeded && GetChromeDefaultState() == IS_DEFAULT);
   }
   if (succeeded && is_default)
     RegisterChromeAsDefaultXPStyle(dist, CURRENT_USER, chrome_exe);
   return succeeded;
 }
 
 bool ShellUtil::MakeChromeDefaultProtocolClient(
     BrowserDistribution* dist,
     const base::FilePath& chrome_exe,
@@ skipping 399 matching lines @@
   base::string16 key_path(ShellUtil::kRegClasses);
   key_path.push_back(base::FilePath::kSeparators[0]);
   key_path.append(prog_id);
   return InstallUtil::DeleteRegistryKey(
       HKEY_CURRENT_USER, key_path, WorkItem::kWow64Default);
 
   // TODO(mgiuca): Remove the extension association entries. This requires that
   // the extensions associated with a particular prog_id are stored in that
   // prog_id's key.
 }