FATMAN.AD/FATMAN.OPL were included as standard in Miles Sound System (not in AIL 2.x). FAT.AD/FAT.OPL were included in MIDPAK. However, many AIL/MIDPAK/MSS games used their own AD (for OPL2) and OPL (for OPL3) patch banks.

Also, FAT2.OP3 and FAT4.OP3 banks were included by default in Junglevision Sound Drive library.

Games I know that contain FATMAN.OPL (all of them Miles Sound System based):

Guts 'n' Garters in DNA Danger
Heroes of Might and Magic II
Spellcross
War, Inc.
Wreckin Crew

Games I know that contain FAT.OPL:

AIL 2.x:

1830: Railroads and Robber Barons
Indycar Racing
Master of Magic
Master of Orion

AIL/16:

Sim Health

MIDPAK:

Battles in Time
Burnt Rubber
Capitalism
Captain Bible in the Dome of Darkness
Discworld
H.U.R.L. (aka Blob 3D aka Slob Zone)
Jammit
Master Won Liu 3D
Multimedia Kaleidosonics
Orbots
Pocahontas
Road Hog!
Road to Baghdad
SSN-21 Seawolf
The 7th Guest
The Grandest Fleet
The Perfect General II
The Pure Wargame

Miles Sound System:

Dinotopia
Fade to Black
Primal Rage

Games I know that use FAT2.OP3 or FAT4.OP3 (all of them Junglevision Sound Drive based):

Machiavelli the Prince
Skunny: Special Edition