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Open File Dialog Box
Excel VBA code shows how to show the built in Excel File Open (or search for file) dialog box such that the user can make a file selection.
Dim FN As String
FN = Application.GetOpenFilename("All files (*.*), *.*")
If FN = "False" Then Exit Sub
'' Perform some other operations on the returned file iteslf as necessary ...
This is another good example of using as much of the in built functionality of Excel as possible.
As Excel is battle-tested, been around for many years and has millions of users, you can be assured that the functions and other user-available operations both work well and work fast.