Help Some Help With Textures And Interface.xdat

so...i downloaded an interface for my HF client,

http://rawr.su/topic/1942-platnyj-interfejs-ot-savo/page-1

there are some problems with it and i would like to fix them BUT interface.xdat doesnt open, it gives me an error saying try an other version and it's not the xdat editors problem coz i can open "clean" interface.xdats, is savos xdat encrypted?

also i want to remove or change the shadow behind Log In and Exit button but i cant find the name of the file, i opened all of the utx files savo provided but i cant find the image in there

http://prntscr.com/cymyx3

any thoughts?
Thanks.