So uh... What does it mean when it says "delete the first 12 bytes of data"?

Look up what a byte is.

You can also just use Ain't No Me In Team's FF dumper and it will create the same zlib file for you, in .dump format (attached).

3. Open up SimpleZip, go to the External progs menu, and click on ZLib (pack/unpack). Under (de)compress, select Decompress and click the "..." button to browse for the common.zlib file and select it. Then, click Start to begin decompression.

alright so i got the .dump file but i can't find the external progs menu mentioned here:

As I said above, the FF dumper creates the zlib file for you. There is no need to do that step if you have the dump already.

OK so i'm in common.ff and i don't see any sound references. Am i in the wrong file?

Try common_mp.ff.

Just did. That didn't help either.

It looks like the .ff's aren't being fully decompressed. 3/4's of it is still just random letters and values.

I got the sounds extracted however they don't play in-game and i don't know why.

Sound aliase:

name,sequence,file,vol_min,vol_max,vol_mod,pitch_min,pitch_max,dist_min,dist_max,channel,type,probability,loop,masterslave,loadspec,subtitle,compression,secondaryaliasname,volumefalloffcurve,startdelay,speakermap,reverb,lfe percentage,center percentage,platform,envelop_min,envelop_max,envelop percentage,conversion
,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,
#ak47,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,
weap_ak74_fire_plr,,weapons/ak74u/weap_ak74_slst_1.wav,0.66,0.73,wpnplyr,1,1.1,500000,,local,,,,0.85,,,,,weapon2
weap_ak47_lift_plr,,foley/wpfoly_ak47_reload_lift_v4.wav,0.55,0.6,wpnplyr,1,1,7,500,reload2d,,,,0.85,,,,,weapon2,100
weap_ak47_clipout_plr,,foley/wpfoly_ak47_reload_clipout_v5.wav,0.55,0.6,wpnplyr,1,1,7,500,reload2d,,,,0.85,,,,,weapon2,
weap_ak47_clipin_plr,,foley/wpfoly_ak47_reload_clipin_v4.wav,0.55,0.6,wpnplyr,1,1,7,500,reload2d,,,,0.85,,,,,weapon2,
weap_ak47_chamber_plr,,foley/wpfoly_ak47_reload_chamber_v4.wav,0.55,0.6,wpnplyr,1,1,7,500,reload2d,,,,0.85,,,,,weapon2,

Launcher errors:

ERROR: Invalid column name 'vol_mod' in cod4.csv at column 5
ERROR: Invalid column name 'channel' in cod4.csv at column 10
ERROR: Invalid column name 'conversion' in cod4.csv at column 29
ERROR: Sound alias file cod4.csv: Unknown curve 'weapon2'
ERROR: Sound alias file cod4.csv: Unknown curve 'weapon2'
ERROR: Sound alias file cod4.csv: Unknown curve 'weapon2'
ERROR: Sound alias file cod4.csv: Unknown curve 'weapon2'
ERROR: Sound alias file cod4.csv: Unknown curve 'weapon2'

The header in your soundalias does not match the header used for the alias lines you have in it.

Thats what i thought but its all from the same soundalias(common.csv) from CoD4's mod tools. Where can i find the correct one?

the weapon2 curve is not valid cod5, change it to something else.

ERROR: Invalid column name 'vol_mod' in cod4.csv at column 5
ERROR: Invalid column name 'channel' in cod4.csv at column 10
ERROR: Invalid column name 'conversion' in cod4.csv at column 29

Those are all columns that don't exist in cod5, remove them from both the header and the lines.

And i have to do that for EVERY alias don't i?

The ones Launcher complains about.

ERROR: Sound alias file cod4.csv: Unknown sound type 'local'; should be primed, streamed or loaded
ERROR: Sound alias file cod4.csv: Unknown sound type 'reload2d'; should be primed, streamed or loaded
ERROR: Sound alias file cod4.csv: Unknown speakermap '100'
ERROR: Sound alias file cod4.csv: Unknown sound type 'reload2d'; should be primed, streamed or loaded
ERROR: Sound alias file cod4.csv: Unknown sound type 'reload2d'; should be primed, streamed or loaded
ERROR: Sound alias file cod4.csv: Unknown sound type 'reload2d'; should be primed, streamed or loaded