File load

I'm not sure how to word this

I want a part of my program to work like the part of the program of blitz where you press the little open button in the top left hand corner, how do I do this?

You can do this with blitzsys.dll which you can get here
http://blitzmirror.fortunecity.com/

Also read this topic
http://www.blitzbasic.com/Community/posts.php?topic=52366