--- Registry.expand_environ(str)
    str  %\w+% Ȥ¤ӤĶѿִޤ
    REG_EXPAND_SZ Ѥޤ
    
    ܺ٤ ExpandEnvironmentStrings [URL:http://msdn.microsoft.com/library/en-us/sysinfo/base/expandenvironmentstrings.asp] Win32 API 򻲾ȤƤ

