How do I

This may be of some use:

http://www.codeproject.com/debug/cdbntsd4.asp

Hey,
".dll" IS the extension. (dynamic link library) So what you do is search for "*.dll" (All files that end with the extension ".dll")
What a "dll" is is a library of functions in a programming language that is loaded at "run time" (when the program is executed).
So, instead of a program being very large with files that are included in the program, the program gets the "dll" files when it runs (the meaning of the word "dynamic"; only get the files when the program runs). Say you want some video compression files, but they are too big to include in your program.
So you have a line in the program like :
#include right before the part using the library runs. The program will load the library, run the program segment, and then free up the memory that was used for the dynamic link.
So basically, "use the dynamic link library when it is needed, then throw it away and go on to the next program segment."
(Depends on the programming language, of course)
Johnny