he visto esto en la ayuda espero que te sirva
If no value is specified for the PrivateDir property, the BDE automatically uses the current directory at the time it is initialized. If your application runs directly from a network file server, you can improve application performance at runtime by setting PrivateDir to a user’s local hard drive before opening the database.
Note: Do not set PrivateDir at design time if you intend to open the database. Doing so generates a “Directory busy” error.
The following code changes the setting of the default session’s PrivateDir property to a user’s C:\TEMP directory:
Session->PrivateDir = “C:\\TEMP”;
Important: Do not set PrivateDir to a root directory on a drive. Always specify a subdirectory.