You will want to look at the file dialog property.
Dim fDialog As Office.FileDialog
MSDN File Dialog
The above shows an example that is performed on a button click
The example adds the selected file to a listbox, for your situation you would want to use a simple textbox instead of the listbox.
You may want to set AllowMultiSelect to false to ignore the looping part if you only want one item. (this would simplify the code in the example for you.
.AllowMultiSelect = false
I may be a lil rusty but then you would want to do something like this(someone edit or correct me if I am way off)
Assuming you used varFile
(Dim varFile As Variant)
Me.TextBox1.Text = varFile
EDIT: After encountering error
It seems the error can come froma few things. Check to make sure the reference is there.
Also you may need to add the Microsoft DAO 3.6 Object Library reference.
See the "More information" section of this Link (Hopefully 2002 is close enough to 2003)
. It may have a few more helpful tips if that doesn't solve the problem.