From VaySoft LTD.:

MS Excel File Properties Changer is an application that will help you to view and modify the Microsoft Office Excel file properties such as summary information, file date-time stamps and file attributes.
You can view and modify Summary Information, include:
Title, Subject, Author, Keywords, Comments, Catagory, Source, Revision Number, Last Saved By, Manager, Company, Create Time/Date, Last saved Time/Date, Total Editing Time, Last Printed
You can view and modify file date-time stamps, include:
Created Time, Modify Time, Last Access Time
You can view and modify file attributes,include:
Read-only, Archive, Hidden, Not in Content index
MS Excel File Properties Change does not require any version of Microsoft Office Excel installed in your computer.
MS Excel File Properties Change supports Microsoft Office Excel files from 1997 to 2007,, include xls and xlsx.
MS Excel File Properties Change can modify Microsoft Office Excel files properties in single and batch mode.
Please viste http://www.vaysoft.com for detail.