When a program specified as the "serviceProvider" in the service configuration is located in another folder than the current working directory, the filename of the status file will be wrong. It looks like the generated status filename will be created on the form: $main_confmain?tmpPath? + serviceProvider +'_' + sid +'.xml'.

This will cause problems because the folder do not exist.

Ex: [serviceName] serviceProvider = c:/zoo/php/script/foo.php

The service folder is: $main_confmain?tmpPath? = c:/zoo/wps/status

The status file will be something like: c:/zoo/wps/status/c:/zoo/php/script/foo.php_XXXX.xml

To use the "service name" instead of serviceProvider as status file name will probably solve this issue.