Python 通过将.xls文件转换为.xlsx再转换回.xls来更改其属性

我有这段代码，可以在其中更改.xls文件的属性，但“last_modified_by”除外，因为当我将其转换回时，我的计算机将是最后一个被修改的人（有时它只是一个emtpy字符串，50-50）。我知道为什么，但是呃。 有没有办法改变这一点？因此，当我在“last_modified_by”中键入“asd”时，输出文件的属性（不想再次写入“last_modified_by”哈哈）将是“asd”

我的代码简介：

  At first i convert the .xls to xlsx. 
  After that i open the file(.xlsx) with openpyxl and change the properties and then save it. 
  At the end i convert it back to .xls and here the "last_modified_by" part changes.

这是我的密码：

import win32com.client as win32
from openpyxl import load_workbook
from xls2xlsx import XLS2XLSX
from datetime import datetime

# xls --> xlsx
x2x = XLS2XLSX("path\\file.xls")
x2x.to_xlsx('path\\file.xlsx')

# set workbook's properties
wb = load_workbook(filename = 'path\\file.xlsx')
wb.properties.title = 'asd'
wb.properties.creator = 'asd'
wb.properties.title = 'asd'
wb.properties.subject = 'asd'
wb.properties.keywords = 'asd'
wb.properties.category = 'asd'
wb.properties.description = 'asd'
wb.properties.creator = 'asd'

wb.properties.last_modified_by = 'asd'   #Here is the "last_modified_by"

wb.properties.created = datetime(2012,1,12,12,12) # Year,Month,Day,Hour,Sec
wb.properties.lastPrinted = datetime(2012,1,12,12,12) # Year,Month,Day,Hour,Sec
wb.properties.modified = datetime(2012,1,12,12,12) # Year,Month,Day,Hour,Sec
wb.save('path\\file.xlsx')

#xlsx --> xls
excel = win32.gencache.EnsureDispatch('Excel.Application')
asd = excel.Workbooks.Open('path\\file.xlsx')
asd.SaveAs('path\\file.xls', FileFormat = 56)       
asd.Close()                                    
excel.Application.Quit()