WPFL

WPFL is a particle effects file usually located in the "Rockstar Games\Grand Theft Auto IV\pc\data\effects" folder

File Format
HEADER offset size data desc

=
=================== 0x00 4 byte offset (24+8 bit) 0x04 4 byte padding [usually 0xCDCDCDCD] * 0x08 4 byte offset (24+8 bit) 0x0C 4 byte offset (24+8 bit) 0x10 4 byte padding [usually 0xCDCDCDCD] * 0x14 4 byte offset (24+8 bit) 0x18 4 byte offset (24+8 bit) 0x1C 4 byte LONG (always 0)

* 0xCDCDCDCD comes from nonallocated memory on Microsoft systems, so the padding can also simply be left 0

DATA HEADER offset size data desc

=
=================== 0x00 4 byte LONG 0x04 4 byte LONG (always 0) 0x08 4 byte LONG (always 0) 0x0C 4 byte LONG (always 1; maybe ID of 1st record ?) 0x10 4 byte offset (24+8 bit) 0x14 2 byte WORD 0x16 2 byte WORD (identical to 0x14) 0x18 4 byte offset (24+8 bit) 0x1C 2 byte WORD 0x1E 2 byte WORD (identical to 0x1C) 0x20 ... varying data (some with corresponding offset+WORD+WORD organisation)

(The offset 0x10 refers to list of LONG values (4 byte) and following 0x14 WORD to the size of the list. List ends with 0xCD padding) (The offset 0x18 refers to another list of offsets (24+8 bit) and the following 0x1C WORD to the size of this list. List ends with 0xCD padding)