Access a file after build in unity

Hey

I am developing a game in unity.

I need a method to read from a dll file during run time. After building the game. I want the exe file to access a dll file in which i intend to store some data. This has to happen at runtime because i want to use the output of another VS program in my unity instance.

I am writing my code in javascript. Please explain any solution in detail cause i am a noob at unity.

Thanks.