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Recipe 578035 revision 5 

import ctypes

class disable_file_system_redirection:
    _disable = ctypes.windll.kernel32.Wow64DisableWow64FsRedirection
    _revert = ctypes.windll.kernel32.Wow64RevertWow64FsRedirection
    def __enter__(self):
        self.old_value = ctypes.c_long()
        self.success = self._disable(ctypes.byref(self.old_value))
    def __exit__(self, type, value, traceback):
        if self.success:
            self._revert(self.old_value)


#Example usage
import os

path = 'C:\\Windows\\System32\\msg.exe'

print os.path.exists(path)
with disable_file_system_redirection():
    print os.path.exists(path)
print os.path.exists(path)

Diff to Previous Revision

--- revision 4 2012-02-06 16:03:08
+++ revision 5 2012-02-06 16:34:02
@@ -11,6 +11,7 @@
             self._revert(self.old_value)
 
 
+#Example usage
 import os
 
 path = 'C:\\Windows\\System32\\msg.exe'

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