exe() on 'System' returns unhandled exception

[mrjefftang]

Python: 3.4.1
psutil: HEAD as of 08/21/2014
OS: Windows XP 32-bit and 64-bit

psutil.Process(4).name() returns 'System'
psutil.Process(4).exe() throws an exception

>>> psutil.Process(4).exe()
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "\psutil\psutil\__init__.py", line 533, in exe
    exe = self._proc.exe()
  File "\psutil\psutil\_pswindows.py", line 206, in wrapper
    return fun(self, *args, **kwargs)
  File "\psutil\psutil\_pswindows.py", line 248, in exe
    return _convert_raw_path(cext.proc_exe(self.pid))
OSError: [WinError 0] The operation completed successfully

>>> psutil.Process(4).as_dict()
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "\psutil\psutil\__init__.py", line 414, in as_dict
    ret = attr()
  File "\psutil\psutil\__init__.py", line 533, in exe
    exe = self._proc.exe()
  File "\psutil\psutil\_pswindows.py", line 206, in wrapper
    return fun(self, *args, **kwargs)
  File "\psutil\psutil\_pswindows.py", line 248, in exe
    return _convert_raw_path(cext.proc_exe(self.pid))
FileNotFoundError: [WinError 18] There are no more files

[mrjefftang]

Under psutil 1.2.1 it correctly throws an AccessDenied

>>> psutil.Process(4).exe()
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "psutil\_common.py", line 85, in __get__
    ret = self.func(instance)
  File "psutil\__init__.py", line 387, in exe
    return guess_it(fallback=err)
  File "psutil\__init__.py", line 380, in guess_it
    raise fallback
psutil._error.AccessDenied: (pid=4)

[giampaolo]

Closing this out as a duplicate of #529