File : queue.dat
 Queue Version : 5.01
          Size : 7168 bytes
    F@H Client : FAH502-Linux.exe

These fields are present in queue.dat and usually only contain zeros.

Some fields, like z192, z224 and z7152 are most likely reserved for future use. Whereas other fields are mostly likely padding, or sometimes contain unknown values, e.g. z500 and z528.

grep "unknown stuff" qd.c
/* There is still sometimes unknown stuff in bytes 500-507 and 528 */

grep "z500\[8\]" qd.c
                char    z500[8];

./qd -q queue.dat -d | grep 500:
   500: 00 00 00 00 00 00 00 00   # Index 3
   500: 00 00 00 00 00 00 00 00   # Index 4
   500: 00 00 00 00 00 00 00 00   # Index 5
   500: 00 00 00 00 00 00 00 00   # Index 6
   500: 00 00 00 00 00 00 00 00   # Index 7
   500: 00 00 00 00 00 00 00 00   # Index 8
   500: 00 00 00 00 00 00 00 00   # Index 9
   500: 00 00 00 00 00 00 00 00   # Index 0
   500: 00 00 00 00 00 00 00 00   # Index 1
   500: 00 00 00 00 03 00 00 00   # Index 2

hexdump -C -s 508 -n 8 queue.dat     # Index 0
000001fc  00 00 00 00 00 00 00 00                           |........|
00000204

hexdump -C -s 1220 -n 8 queue.dat    # Index 1
000004c4  00 00 00 00 00 00 00 00                           |........|
000004cc

hexdump -C -s 1932 -n 8 queue.dat    # Index 2
0000078c  00 00 00 00 03 00 00 00                           |........|
00000794

hexdump -C -s 2644 -n 8 queue.dat    # Index 3
00000a54  00 00 00 00 00 00 00 00                           |........|
00000a5c

hexdump -C -s 3356 -n 8 queue.dat    # Index 4
00000d1c  00 00 00 00 00 00 00 00                           |........|
00000d24

hexdump -C -s 4068 -n 8 queue.dat    # Index 5
00000fe4  00 00 00 00 00 00 00 00                           |........|
00000fec

hexdump -C -s 4780 -n 8 queue.dat    # Index 6
000012ac  00 00 00 00 00 00 00 00                           |........|
000012b4

hexdump -C -s 5492 -n 8 queue.dat    # Index 7
00001574  00 00 00 00 00 00 00 00                           |........|
0000157c

hexdump -C -s 6204 -n 8 queue.dat    # Index 8
0000183c  00 00 00 00 00 00 00 00                           |........|
00001844

hexdump -C -s 6916 -n 8 queue.dat    # Index 9
00001b04  00 00 00 00 00 00 00 00                           |........|
00001b0c