I do not know about ArtaTech, but it should not be a problem to install and use OFTM file manager.
I use OFTM on non ArtaTech for long time and no problem. Instalation is not the problem.
OFTM allows you along with others delete system files... So you should know what you do, if you are browsing system partition.
Also OFTM allows user to set powermanagement times for standby and off more freely than standard Onyx interface. I use standby 30 min and never off.