By first, install a Microsoft Access Database Engine 2010 into your CustomTools database server machine. You can download the Access Database Engine 2010 from MS download center.
NOTE: If you have 64-bit SQL Server installed, download and install a 64-bit version of the Access Database Engine as well.
Then, place your CSV file into the same server machine and create an External database link with CustomTools Administration Tool with the following instructions:
NOTE: The path have to be defined from a point of view of the server machine where the file is located at.
External Data Sources