The requirement: to determine who owns a file
This uses the Windows security API which isn't the easiest thing in the world to come to grips with. In this case, however, it's not too bad. We'll get the file's security descriptor, pull out of that the field which refers to the owner and then translate that from the ubitquitous-but-impenetrable SID to a user name.
import win32api import win32con import win32security FILENAME = "temp.txt" open (FILENAME, "w").close () print "I am", win32api.GetUserNameEx (win32con.NameSamCompatible) sd = win32security.GetFileSecurity (FILENAME, win32security.OWNER_SECURITY_INFORMATION) owner_sid = sd.GetSecurityDescriptorOwner () name, domain, type = win32security.LookupAccountSid (None, owner_sid) print "File owned by %s\\%s" % (domain, name)