Need help desparately vb in Access

I am trying to write a macro to import an *xml file into Access.
After I select the file, I have no problem. I need to write a macro that will allow me to view a selected directory and then choose the file from among many.
I need to lookk ar the dir select a file, put that filename into a variable and then put that variable name into this

example:
Application.ImportXML "c:\a_b\xml_ab\2004\{filename}, acAppendData"

Anyone, PLEASE HELP!!!! :-(