A few customers use the Microsoft SQL Server Compact Data Provider and a local .sdf file (stored in the test project folder) to provide data to a data driven test. Currently they have to provide a hard coded absolute path to the .sdf file in the connection string. This becomes a problem when the project is moved from one computer to another where the path may change (because the test project is put into a different folder).

If you try to use a relative path, the starting point is the Test Studio installation bin folder. Environment variables are ignored as well. If the starting point were changed to the test project folder and/or environment variables were supported, the customer would be able to specify some sort of relative path.