Better way to do it: make a folder called newvision in your core deusex folder (C:\Deusex) and put the textures inside that, in a subfolder called textures, then edit your deusex.ini to look in that folder first:
Open deusex.ini and find
Paths=../Textures/*.utx
add this line,
above that one:
Paths=..NewVision/Textures/*.utx
Thus it will look in the NV folder first, use any textures it finds there, and failing that, go on to find the originals.
