We have discovered a bug when trying to run a discovery, then audit from a Windows installed Open-AudIT server.
To fix this issue, edit the file c:\xampp\open-audit\code_igniter\application\controllers\include_input_discoveries.php
Change lines 1156 & 1158 from:
This patch will be included in the soon to be released Open-AudIT 3.0.1.
Apologies for any inconvenience.