Default [Q] How to change/edit CM 10.1 theme easily?

Hi, i want delete this file from this theme https://play.google.com/store/apps/d...eme.circlelite

res\drawable-hdpi\com_android_phone_picture_unknown.png

how can i do that? if i edit it with 7zip.. phone cant install it.. there is some kind of security or something? thanks.
░▒▓█ Phone ► Samsung Galaxy S4 i9505
░▒▓█ ROM ► GoldenEye XXUFNC9 EXTRALITE (only 604mb)
░▒▓█ Recovery ► Philz Touch 6.25.4
░▒▓█ Kernel ► Adam Kernel 2.3