gistfile1.txt

-snip-

12 00 08 00 00 00 00 52 4D 48 CD 13 00 08 00 00 00 00 4E 8A E1 D4 28 00 08 00 00 00 00 00 00 00 00 A9 03 00 74 10 06 5F 5F 75 74 6D 7A
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ <-- tag 0x12: expiry
                                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ <-- tag 0x13: last used
                                                                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ <-- tag 0x28: download start time
                                                                                                   @@@@@@@@@@@ <-- UNKNOWN DATA!
                                                                                                               ^^^^^^^^^^^^^^^^^^^^^^^ <-- tag 0x10: name
-snip-

Note, tags are a 1 byte identifier with a 2-byte length, then the data
Flags are just a 1 byte identifier.

Also note 0xA9 == 0x29|MSB

Possibilities:
 * I'm parsing 0x28 wrong
 * 0x29 is a flag with 3 bytes of extra data?
 * Something else?

Data interpretation:

ID: 12
len: 00 08
data: 00 00 00 00 52 4D 48 CD

ID: 13
len: 00 08
data: 00 00 00 00 4E 8A E1 D4

ID: 28
len: 00 08
data: 00 00 00 00 00 00 00 00

UNKNOWN DATA: A9 03 00 74

ID: 10
len: 00 06
data: 5F 5F 75 74 6D 7A