I would anticipate that if you go to Help>About, then you should see the exact version number.
Go to the installed location of the program and check to see the date stamp of the files. The new ones should be around Feb end, whereas the others would say Sept'09
That's exctly the reason why I'm posting the question; When PE comes UP it shows PE8.0 and when I go to the Help->About mine shows 8.0 M178-9/8/2009.
I have no idea what saids before.
Yeap, I have 19 files modified on 2/26/2009.