VB can do what you would like. VB opens and closes files with the key words OPEN and CLOSE. So you could look up OPEN in VB help, or do a search on google. I found this site after a quick search.
http://www.garybeene.com/vb/tut-file.htm. Or you could go get another book on VB. The VB book written by diteil and deteil is pretty good. One more thing to keep in mind is that VB has other ways to access files besides the basic open and close commands; there is also the file system objects and that would be worth looking into.
I hope this helps.