How to get a list of files

Sub ShowFileList(folderspec)
    Dim fs, f, f1, fc, s
    Set fs = CreateObject("Scripting.FileSystemObject")
    Set f = fs.GetFolder(folderspec)
    Set fc = f.Files
    For Each f1 In fc
        s = s & f1.Name
        s = s & vbCrLf
    Next
    MsgBox s
End Sub