nsclient++ on Windows, checking exit_codes

[kuchenmann]

I must confess, I do not really understand how this nsclient++ and NRPE are working (Nagios-core).
I have some tasksched_checks, but some of them are show _exit_code'=0;0;0 ' but show CRITICAL-alarms.
Others have _exit_code'=0;0;0 and show "OK".
And I also get exit-codes like _exit_code'=200;0;0 and the show WARNING.
I also get exit code exit_code'=500;0;0 '.