Sub ChDirNet(szPath As String)
    SetCurrentDirectoryA szPath
End Sub

Sub Combine_Workbooks_Select_Files()
    Dim MyPath As String
    Dim SourceRcount As Long, Fnum As Long
    Dim mybook As Workbook, BaseWks As Worksheet
    Dim sourceRange As Range, destrange As Range
    Dim rnum As Long, CalcMode As Long
    Dim SaveDriveDir As String
    Dim FName As Variant

    With Application
        CalcMode = .Calculation
        .Calculation = xlCalculationManual
        .ScreenUpdating = False
        .EnableEvents = False
    End With

    SaveDriveDir = CurDir
    ChDirNet "C:\"

    FName = Application.GetOpenFilename(filefilter:="Excel Files (*.xl*), *.xl*", _
                                        MultiSelect:=True)
    If IsArray(FName) Then
        Set BaseWks = Workbooks.Add(xlWBATWorksheet).Worksheets(1)
        rnum = 1
        For Fnum = LBound(FName) To UBound(FName)
            Set mybook = Nothing
            On Error Resume Next
            Set mybook = Workbooks.Open(FName(Fnum))
            On Error GoTo 0
            If Not mybook Is Nothing Then
                On Error Resume Next
                With mybook.Worksheets(1)
                    Set sourceRange = .Range("A1:A25")
                End With
                If Err.Number > 0 Then
                    Err.Clear
                    Set sourceRange = Nothing
                Else
        If sourceRange.Columns.Count >= BaseWks.Columns.Count Then
                        Set sourceRange = Nothing
                    End If
                End If
                On Error GoTo 0

                If Not sourceRange Is Nothing Then

                    SourceRcount = sourceRange.Rows.Count

                    If rnum + SourceRcount >= BaseWks.Rows.Count Then
                        MsgBox "Not enough rows in the sheet. "
                        BaseWks.Columns.AutoFit
                        mybook.Close savechanges:=False
                        GoTo ExitTheSub
                    Else
                        Set destrange = BaseWks.Range("A" & rnum)
                        With sourceRange
                            Set destrange = destrange. _
                                            Resize(.Rows.Count, .Columns.Count)
                        End With
                        destrange.Value = sourceRange.Value

                        rnum = rnum + SourceRcount
                    End If
                End If
                mybook.Close savechanges:=False
            End If
        Next Fnum
        BaseWks.Columns.AutoFit
    End If
ExitTheSub:
    With Application
        .ScreenUpdating = True
        .EnableEvents = True
        .Calculation = CalcMode
    End With
    ChDirNet SaveDriveDir
End Sub