I confirmed the problem again this morning, this time launching Excel directly from the Start menus and then opening the file (instead of double-clicking the file itself). Same thing as before ......

I just duplicated the problem with a brand new Excel file that had nothing to do with the old XP machine ...

Signed in as the original owner who is in the administrator group
Created a new...

When Excel saves my workbook file, it changes the NTFS ownership of the file to the user account that is using Excel. I need it to allow the data to be changed within the workbook, but not change...