This is the 563rd most frequent Polish word.
filmie
"Filmie" means "movie" or "film" in the locative case in Polish.
Here 'filmie' is the locative singular form, indicating the place ('in the film').
Oglądam ciekawy dokument o przyrodzie w tym filmie.
I am watching an interesting documentary about nature in this film.
Again, 'filmie' is the locative singular, specifying information about the film being discussed.
W filmie tym występują znani aktorzy.
In this film, famous actors perform.
'Filmie' serves as the locative singular form, used with the preposition 'w', describing where details are found.