The PRM file identifies resources (such as line list catalogs, user dictionaries, etc.) to the application. Specifically, the PRM file identifies each resource and its location (directory path). The PRM file also organizes the resources by discipline and application, associating resources to specific applications. Therefore, you get the correct resource, equipment catalog for instance, for the resource you are working in.
The project administrator needs to define a PRM file for the project, identifying the location of all resources needed by the application. The file is in XML format and can be edited with any text or XML editor.