[NumLock]

Return value

If the function succeeds, the return value is greater than 31.

If the function fails, the return value is one of the following error values.Return code/value Description
0
The system is out of memory or resources.
ERROR_BAD_FORMAT
The .exe file is invalid.
ERROR_FILE_NOT_FOUND
The specified file was not found.
ERROR_PATH_NOT_FOUND
The specified path was not found.

ERROR_BAD_FORMAT = 11;
ERROR_FILE_NOT_FOUND = 2;
ERROR_PATH_NOT_FOUND = 3;

достаточно с 32 сравнить