Hi!
Is the problem that you are using the path to the scripts folder in your soapUI tests? If so, you should be able to parametrize the path to be different if running on Windows and on Mac OS X using
System.getProperty("os.name") for example.
If the problem is how to distribute the custom Groovy among the different clients, one way is to have the scripts folder on each platform be under version control (using Subversion for example) and pointing to the same common path in the SCM repo.
That way, you could make changes in the custom scripts one one client and just update the folder from the SCM on the other.
Please send us the project file using the support form if you need further assistance:
http://www.soapui.org/Support/support-overview.html
