Change date of creation in PowerPoint (Office for Mac 2008)

I have a PowerPoint presentation that I made last year for a Communications class. Now, I want to use it again in a presentation that I am giving for another class with another professor, so I am basically re-using the presentation again. Now, in case the professor goes that far as to checking when the file was created, I wanted to make sure the date that the file was created is more recent, and not last year.

Is there any way I can change the date of creation of a .ppt presentation?

Thanks