1. The directory from which the application binary was loaded.
2. The application's current directory.
3a. [Windows NT/2000/XP only] 32-bit system directory
(default: c:\winnt\System32)
3b. 16-bit system directory
(default: c:\winnt\System or c:\windows\system)
4. The windows directory
(default: c:\winnt or c:\windows)
5. The directories listed in the PATH environment variable

기초부터 공부 해야겠습니다.
알고있다 생각했던 모든게 새로워 지는군요...>.<