Here is the readme file:
 
A new soundpack for Operation flashpoint: Cold War Crisis and Resistance. It works without problems in multiplayer, because there are no config.bin file modifications. The only thing you have to replace is sound.pbo.

 

This sound mod was created from a conglomeration of sounds, taken from various sound mods and games, and custom made by myself.

Almost all sounds have been changed.

New sounds:

- M16 Assault Rifle (v3.9)
- AK74 Assault Rifle (v3.9)
- G36a Assault Rifle (v3.6)

- Steyr Aug Assault Rifle (v3.9)
- XM and XMS Assault Rifles (v3.9)

- HK Sub-Machine gun (v3.9)

- Hunting Rifle (v3.9)

- All Handguns (V3.9)
- M21 sniper rifle (v3.5)

- SVD Dragunov sniper rifle (v3.5)
- LAW and RPG Launchers (v3.5)
- AT Launcher (v3.5)
- Grenade launchers (v3.9)

- Hand Grenade (V3.5)
- New sounds for M60 and PK machine guns (v3.9)
- M2 Machine Gun (v3.5)
- Satchel Charges and mines (v3.5)
- All explosions (vehicle explosion, rocket explosion, sabot explosion, etc.) (v3.5)
- New heat and sabot sounds for all tanks (v3.5)

- Chopper rocket launchers (v3.9)
- T72 and M60 engine (v3.5)
- Better quality M1A1 Abrams, M2A2 Bradley and M113 engine sounds (v3.5)
- Jeep engine (v3.5)
- New cannon sound for Shilka, Vulcan and all choppers (v3.5)
- AH-1 Cobra engine (v3.5)
- A-10 Thunderbolt and Su-25 engine (v3.5)
- and many more

- Sounds like Thunder and different environmental sounds have also been changed. (v3.9)

How to install?
 

- Sound.pbo goes in ...\Operation Flashpoint\Res\DTA
- G36a.pbo and Steyr.pbo goes in ...\Operation Flashpoint\Res\Addons
- AlexSound.pbo goes in ...\Operation Flashpoint\Addons (Not in Res addons)