I edit the episode name by right click the file then in properties edit the wtv and add episode name and synopsis etc then this from another forum site:
Removing mcepg2-0.db and rebooting did the trick to update the Recorded TV titles, etc. in Media Center with what's in the Windows Media Player Library.But, like you also said, I had to go through the initial Windows Media Center TV Setup process again. This also means I'll have to set my recording schedule, EPG Add/Remove Channel settings, etc
It still does not group renamed shows with other episodes i.e. a renamed Bonanza is separate from the other epidodes but this will update the properties of the episode in WMC.