12.5.11 Error Codes in -10000 Range
Error codes in the -10000 range represents Microsoft error codes. To determine the Microsoft error code, make the number positive (-10121 becomes 10121) and subtract 10000 (10121 - 10000 = 121). Microsoft error codes can be found at:
msdn.microsoft.com/en-us/library/windows/desktop/ms681382(v=vs.85).aspx