PAL films are generally stored progressive but at 25fps instead of 24fps (no framerate conversion, just plays back faster) with the audio sped up to match the faster playback rate.

Although saying that a fair amount of films on PAL DVD are flagged as interlaced (!) despite them having progressive footage. But not all films on PAL DVD just play back 4.096% faster, my R4 Spirited Away DVD has been framerate converted from 24fps to 25fps, the end result is a sub-standard interlaced picture that doesn't look too good, especially on a PC screen.