how to rename files in vba code example

Example: vba rename files in a folder

Sub RenameFiles()
'Updateby20141124
Dim xDir As String
Dim xFile As String
Dim xRow As Long
With Application.FileDialog(msoFileDialogFolderPicker)
    .AllowMultiSelect = False
If .Show = -1 Then
    xDir = .SelectedItems(1)
    xFile = Dir(xDir & Application.PathSeparator & "*")
    Do Until xFile = ""
        xRow = 0
        On Error Resume Next
        xRow = Application.Match(xFile, Range("A:A"), 0)
        If xRow > 0 Then
            Name xDir & Application.PathSeparator & xFile As _
            xDir & Application.PathSeparator & Cells(xRow, "B").Value
        End If
        xFile = Dir
    Loop
End If
End With
End Sub