I dont think they can be used in the editing mode. But if for instance you want to exchange hairs or give duffs hair, per say, to giuly, which are preset faces, you can.
E.g, lets say that duffs preset face number is 20 and giuly's is 25. Tha means that his preset hair number will be the same as their respective faces, i think. So in theory you can open the 0_text file find the hair files (like hairw or hairk, which are the preset hairstyles i think) that you want and merely import and export as you would with faces or boots using Graphic studio. Only problem is finding the right files. Ive tried viewing them with GS but it crashes almost everytime. But, again, i doubt you can use them in edit mode. You could try to import one of the preset styles into one of the other files that, i think, are part of the editing selection, like hair20010, and see if it works...
