To your first post:
You have to supply the project manager placed in a specific folder with project.xml folder. If you have projects.xml in other folder with other project managers you will have to supply it where needed. You can also place different project manager in the same folder using a single projects.xml file by renaming the project managers ( Sitefinity1210, Sitefinity1339, Sitefinity and the last will be the one that you can run when you need other you rename it to Sitefinity and run ).
To your second post:
The paths should be the same when you create a new project. Copying the XML file will not change it in any way.
the Telerik team
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