Use a better registration suffix that will always be unique while respecting the MSDN rules.

base/win/win_util.h

 // 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.
 
 // =============================================================================
 // PLEASE READ
 //
 // In general, you should not be adding stuff to this file.
 //
 // - If your thing is only used in one place, just put it in a reasonable
@@ skipping 29 matching lines @@
 // A Windows message reflected from other windows. This message is sent
 // with the following arguments:
 // hWnd - Target window
 // uMsg - kReflectedMessage
 // wParam - Should be 0
 // lParam - Pointer to MSG struct containing the original message.
 const int kReflectedMessage = WM_APP + 3;
 
 BASE_EXPORT void GetNonClientMetrics(NONCLIENTMETRICS* metrics);
 
-// Returns the string representing the current user sid.
+// Sets |user_sid| to the current user's sid.
+// Returns true on success.
 BASE_EXPORT bool GetUserSidString(std::wstring* user_sid);
 
+// Sets |user_sid| to a base 16 encoding (using A-N range) of the current user's
+// sid. This will fit in exactly 24 characters.
+// Returns true on success.
+BASE_EXPORT bool GetUserSidBase16Encoded(string16* user_sid);

[gab, 2012/06/21 05:55:41]

Maybe this doesn't belong here idk...

+
 // Returns true if the shift key is currently pressed.
 BASE_EXPORT bool IsShiftPressed();
 
 // Returns true if the ctrl key is currently pressed.
 BASE_EXPORT bool IsCtrlPressed();
 
 // Returns true if the alt key is currently pressed.
 BASE_EXPORT bool IsAltPressed();
 
 // Returns false if user account control (UAC) has been disabled with the
@@ skipping 46 matching lines @@
 // This is necessary to set compatible struct sizes for different versions
 // of certain Windows APIs (e.g. SystemParametersInfo).
 #define SIZEOF_STRUCT_WITH_SPECIFIED_LAST_MEMBER(struct_name, member) \
     offsetof(struct_name, member) + \
     (sizeof static_cast<struct_name*>(NULL)->member)
 
 }  // namespace win
 }  // namespace base
 
 #endif  // BASE_WIN_WIN_UTIL_H_