Create Database on a Virtual Drive (Created with subst) Failed

When I try to add a (SQL Server 2005 Express Edition) database to my project (I'v tried a windows application and an ASP.NET application) in Visual Studio 2005 Professional Edition; It fails with an error like this :
"create database failed. some file names listed could not be created (...)"
but when I open the project from the real path It works.
Is this a bug? Is there any solution? (In many situations there is a need for working with virtual drives. There must be some work around ...)

Thanks

SQL Server does not recognize OS level 'mapped' drives.

You must use a 'actual' drive, or a SAN/NAS lun(drive).