select a item in userform listbox to open a file

Ha all, how do I select a item in a listbox to open a file?
The file is located in c:files
The filename is the same as the selected item in column A
Then, I have 2 other listboxes, one must show column A of the selection and the other column C.
Any help will be apriciated
I have googled but don't find anything usefull for me, the only code I have is:

LISTBOX1.SELECTED.VALUE = LISTBOX2.VALUE