I still use Cinemania ’96 to look up movies and tell me the difference between Panavision and Panascope. Microsoft stopped issuing new versions eventually and no one else has come up with anything quite as good. I can eke out a little more info by getting the updates and installing those, which gets me current through the summer of 1996.
You can get downloads from Microsoft’s FTP site (updates for other versions of Cinemania as well as Encarta are available there too by going up to parent directories and then back down):
Download the executables, double-click to run them which will give you a bunch of .cin files. Rename them to give them the extension .cin96upd
Put them in the Program Files/Microsoft Multimedia/Cinemania folder. Then when you run Cinemania from CD again, it should see the files and incorporate them.