The autoloaddir property is set by default in the CcServer.properties -> com.corticon.ccserver.autoloaddir property. By default, the value is set to [CORTICON_WORK_DIR]/cdd in the form:
where %CORTICON_WORK_DIR% is the absolute path of the work directory, typically C:/Users/{username}/Progress/Corticon x.x
If you decide you would rather specify your own directory, then add the com.corticon.ccserver.autoloaddir property with your preferred value to the brms.properties file. This will be used to override the default.
Note: Be sure to write your absolute pathname using forward slashes, as shown above.