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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/ t( u9 A7 M8 M( U| 32-bit value: Number of PICTs in the structure | & |4 k& H+ |* o) N( @
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| Array of 32-bit values, size (number of PICTs + 1): The absolute offsets of each PICT from the | - @' t- |$ e+ ?4 A8 }
| beginning of the file. The last offset value is used to determine the size of the last PICT in the structure. 4 L/ t* }" J7 b
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| Array of 32-bit values, size (number of PICTs): The duration (in milliseconds) associated with | : ~0 s- m' B' N$ @) B8 A1 A4 W3 s- h
| each PICT (for animations) | 3 w% u; q6 |7 r
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| variable length PICT data | 3 W4 {' k: e/ `: N; y" c% p
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