Sub Test()
Dim wb As Workbook
Dim wb2 As Workbook
Dim ws As Worksheet
Dim vFile As Variant
Set wb = ActiveWorkbook
vFile = Application.GetOpenFilename("Excel-files,*.xls*", 1, "Select One File To Open", , False)
If TypeName(vFile) = "Boolean" Then Exit Sub
Workbooks.Open vFile
Set wb2 = ActiveWorkbook
wb2.Worksheets("Sheet1").Cells.Copy wb.Worksheets("Sheet1").Range("A1")
wb2.Close False
End Sub