readxl读取xls格式Excel可能出现数据混乱

R的readxl是个很棒的XLS和XLSX解析包，但最近发现它读取XLS（MicroSoft Excel 97-2003工作表）格式的时候，会出现数据混乱的情况，如果转为XLSX后则没有这个问题了，下面是找到的一个VBA，可以批量把XLS格式转为XLSX，方便readxl读取，

Sub ChangeFileFormat()

    Dim strCurrentFileExt   As String
    Dim strNewFileExt       As String
    Dim objFSO              As Object
    Dim objFolder           As Object
    Dim objFile             As Object
    Dim xlFile              As Workbook
    Dim strNewName          As String
    Dim strFolderPath       As String

    strCurrentFileExt = ".xls"
    strNewFileExt = ".xlsx"

    strFolderPath = "C:\Users\Scorpio\Desktop\New folder"
    If Right(strFolderPath, 1) <> "\" Then
        strFolderPath = strFolderPath & "\"
    End If

    Set objFSO = CreateObject("Scripting.FileSystemObject")
    Set objFolder = objFSO.getfolder(strFolderPath)
    For Each objFile In objFolder.Files
        strNewName = objFile.Name
        If Right(strNewName, Len(strCurrentFileExt)) = strCurrentFileExt Then
            Set xlFile = Workbooks.Open(objFile.Path, , True)
            strNewName = Replace(strNewName, strCurrentFileExt, strNewFileExt)
            Application.DisplayAlerts = False
            Select Case strNewFileExt
            Case ".xlsx"
                xlFile.SaveAs strFolderPath & strNewName, XlFileFormat.xlOpenXMLWorkbook
            Case ".xlsm"
                xlFile.SaveAs strFolderPath & strNewName, XlFileFormat.xlOpenXMLWorkbookMacroEnabled
            End Select
            xlFile.Close
            Application.DisplayAlerts = True
        End If
    Next objFile

ClearMemory:
    strCurrentFileExt = vbNullString
    strNewFileExt = vbNullString
    Set objFSO = Nothing
    Set objFolder = Nothing
    Set objFile = Nothing
    Set xlFile = Nothing
    strNewName = vbNullString
    strFolderPath = vbNullString
End Sub