Data Link File
Type: OLE DB Provider
Usage: File Name=c:\myDataLinkFile.udl
Usage: File Name=c:\myDataLinkFile.udl
Manufacturer: Microsoft
UDL
Although it is possible to supply connection information in a Universal Data Link (UDL) file you should avoid doing so. UDL files are not encrypted and expose connection string information in clear text. Because an UDL file is an external file-based resource to your application, it cannot be secured by the application.
File Name=c:\myDataLinkFile.udl;
:-)