I developed many Macros on Excel Spreadsheet in June of 2004 on 2003 Excel Spreadsheet on Windows XP. My client is using it on Excel 2013 on Windows 8, and wants to modify the Macros. Currently, he is not able to modify the Macros in Excel 2013 software. What must he do to modify them? It will not accept my Visual Basic password that is used in my 2003 Excel Spreadsheet to open in his 2013 Excel Spreadsheet. When I tried, I was able to open the Macros on my old PC using 2003 Excel, and Windows XP.