The following code is supposed to start a new process calc.exe in debug mode. However, it fails with the code 2 or ERROR_FILE_NOT_FOUND. However, this file calc.exe does exist on the system. What could be wrong with this code? Is there an issue with the path that can be improved so this works?

from ctypes import *
kernel32 = windll.kernel32

WORD      = c_ushort
DWORD     = c_ulong
LPBYTE    = POINTER(c_ubyte)
LPTSTR    = POINTER(c_char)
HANDLE    = c_void_p

class STARTUPINFO(Structure):
    _fields_ = [
        ("cb",            DWORD),
        ("lpReserved",    LPTSTR),
        ("lpDesktop",     LPTSTR),
        ("lpTitle",       LPTSTR),
        ("dwX",           DWORD),
        ("dwY",           DWORD),
        ("dwXSize",       DWORD),
        ("dwYSize",       DWORD),
        ("dwXCountChars", DWORD),
        ("dwYCountChars", DWORD),
        ("dwFillAttribute",DWORD),
        ("dwFlags",       DWORD),
        ("wShowWindow",   WORD),
        ("cbReserved2",   WORD),
        ("lpReserved2",   LPBYTE),
        ("hStdInput",     HANDLE),
        ("hStdOutput",    HANDLE),
        ("hStdError",     HANDLE),
    ]

class PROCESS_INFORMATION(Structure):
    _fields_ = [
        ("hProcess",    HANDLE),
        ("hThread",     HANDLE),
        ("dwProcessId", DWORD),
        ("dwThreadId",  DWORD),
    ]

DEBUG_PROCESS = 0x00000001
creation_flags = DEBUG_PROCESS

startupinfo         = STARTUPINFO()
startupinfo.dwFlags     = 0x1
startupinfo.wShowWindow = 0x0
startupinfo.cb = sizeof(startupinfo)

process_information = PROCESS_INFORMATION()

result = kernel32.CreateProcessA("C:\Windows\System32\calc.exe",
                        None,
                        None,
                        None,
                        None,
                        creation_flags,
                        None,
                        None,
                        byref(startupinfo),
                        byref(process_information)
)

print(result)
print(kernel32.GetLastError())