Provider=Microsoft.Jet.OLEDB.4.0;Data Source=c:\myDb;Extended Properties=Paradox 5.x;
Please note that you should only specify the folder where the database resides. Not the database name itself.
How to Use JET in 64 bit environments
This connection string (Standard (Paradox) using Microsoft.Jet.OLEDB.4.0) can be used for connections to
Start over in the connection string reference index.
You can also get help in the Q&A forums where you can ask your own question.
The kb articles contains how-tos and instructions and you can search for anything if you're not sure were to look.