PFF stands for "PICT Flick File." It's a custom format HyperBole Studios developed for storing animations, somewhat similar to GIF files. PICTs are Apple-format images (see http://en.wikipedia.org/wiki/PICT). Here's some documentation that describes the format of PFF files.
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9 j% ^. a4 e, a% R' r| 32-bit value: Number of PICTs in the structure |
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/ _$ `1 ~& F% r| Array of 32-bit values, size (number of PICTs + 1): The absolute offsets of each PICT from the |
% c" D1 L* r5 Q- S9 G7 y' @$ [| beginning of the file. The last offset value is used to determine the size of the last PICT in the structure.
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| Array of 32-bit values, size (number of PICTs): The duration (in milliseconds) associated with |
% \3 f2 G8 g9 h+ M! q5 c( f| each PICT (for animations) | ' M; ~) k6 ]) v; ~% G6 s) Z
|______________________________________________________________________________| ! P+ L' p. G8 C4 [
| variable length PICT data | , ^: w: v& N# z+ ?- _0 {
|______________________________________________________________________________| |