But... if you do then.
Download cod xmodel exporter.
make a folder on desktop called "cod4"
then direct it to there it should make up a lot of folders. "images, materials xmodel, xmodel alias,xmodel surfs. and mabey some more.
Anyway copy everything thing from your "raw" folder there then go in to each "iw_" and if it has one of the above folders transfer everything from that folder to yours (make sure it copys otherwise the game wont work) to open up "iw_" just download win rar. then once you have done that, open up xmodel exporter choose a xmodel e.g "weapon_p90" click make to ".obj" to open up the .obj open it up in maya then to attack the images to it.
The image is usually called weapon_"name"_c so look out for them and use the .dds converter that came with it to make the .iwi to a .dds so maya can read it. to open the .dds (if you need to) download paint .net (also free) then if you want to do animations then if you go in to "C:\Program Files\Activision\Call of Duty 4 - Modern Warfare\bin\maya\animation_src\viewmodel\m16" there the files that you will need the most.
you dont really need gunsleeves though, anyway open up the m16.vmgun.mb then thats the one with the bones. import you p90 model and delete the m16 (NOT the bones) and re-attach the bones to the p90 were it applys (e.g select J_clip and select the magazine) but for the "tag_" move them do not bind so if its "tag_flash" move it to the muzzle is for the flash.
save that then open up viewmodel_m16_animation then go down to preference or refence then reload it and it should so up with your model, click the play buttom then theres you animations. with pretty much all guys the animations wont fit so you have to move each bit your self by slecting it and press "s" to "key save" it and will log in that position.
to export (presuming you have done that bit so it comes up with cod tools in the courner if it doesnt then you will have to ask someone else as i dont want to waste another lot of cash of a maya 8 licence.) anyway go to window -> hypergraph select everything. but then press dont ctrl and select over the 8th coloum which would be small then go to cod tools -> animation exporter then select what frames your going to export and make sure click set export otherwise it wont work. anyway it should work with no errors then you have your .xanim.
BTW for the model go to your .obj save it as a .mb (by simply clicking save as) and go to cod tools -> model exporter finding your .mb then select your model then click export (but bear in mind there will not be any animations)
anyway thats alot off of my chest if you need anyhelp just WB