jonthefon, do you have messenger or some other like that btw?
well yesterday, i know ive already run into a problem for extracting 05 skin files from the viv file found under the 'nba live 2005/sgsm/common' folder and it was called xplrtex.viv. what i did was use EAge to extract and that was the problem. so, instead what you should do is use(<=actually..DONT use, cause i found out doesnt work either. so the easier way is to just copy all 15 items of what seushiro has provided for us) biggui to open the viv file and extract the skin files 00-42(15 items total, not 43

) from there onto desktop or whereever you find easier, preferrably into a new folder or something, that way you dont have a messy desktop.
edit:

omg...i thought of something just now...i feel so stupid. you dont even need to extract 05 skin files, just use 07's skin texture altogether with the sweat alphas
edit(AGAIN..

): UGH! ok...nvm. it wasnt really stupid afterall. you DO need to extract skin files from 05. i was thinking of something else. the reason you need it is cause, well, 07's skin format is different from 05 and you need all of the skinxx to be able to import the finished conversion of BMP file from the .dds file
opening up the fsh files and exporting, hopefully you know what to do there.
now onto the photoshopping part, you open up the exported .dds file and there should be a box that says 'DDS Read Properties'. select 'Load Using Default Sizes' and say ok. after your file is opened(the positioning of the tool boxes should probably be by default, unless you repositioned them yourself), create a new document 512x512, go to the 'channels' tab....basically, well my probably long explained tuto is about the same as what seushiro did, but using the alpha files that SUM07 is currently using. heres his thread that kinda begins explaining it all, or at least most of it
http://www.nbaliveforums.com/sutra738871.php#738871
just kinda thought it was funny in a way cause you said
jonthefon wrote:If you could give me a quick tutorial on adding alpha channels on Photoshop, I could probably try it...
and here i am about to give almost a long explanation. anyway, when you get into selecting the alpha channel, do select all and then drag it onto the new document the skin already being there and from that point, you could just mess around with the opacity/fill/blending change/the little adjustments(which can be found under image>adjustments>[whatever that you would like to choose to adjust]