Open Androidx86 system.img to edit init.sh

I have been trying to open the system.img on my Androidx86 installation to add rmmod i2c-hid and modprobe i2c-hid to it because the touch on my Tablet doesn't seem to work in Android x86. I have already tried to open it with EXT4 Unpacker, but it says Unknown file format when I try to open the system.img.

Any suggestions, guys?