I replaced the kernel of my hackintosh with the new 8.10.3 SS3, I did it manually with Onyx, after I replaced and select the option to hide the hidden files again but mach_kernel is not hide, how I can manually hide it? Thanks for any help!

sudo ./setfile -a V /mach_kernel

I have an error

Terminal:

cd /
pico .hidden
mach_kernel

press crrl-x and y to save

restart Finder

It works, thanks! but let me write step by step for noobs:

Open terminal
cd /
pico .hidden
mach_kernel
press ctrl-x and y to save
press ENTER
Relaunch Finder (Command + Alt + ESC)

I used xray 1.1 to do this as well.

you can check if you have setfile 'installed' by typing
which setfile

This should output something like '/usr/bin/setfile'. If you get no output, it means you don't have the setfile tool.

if you got success with the 'which setfile', then try without the ./
setfile -a V /mach_kernel