I have a question regarding moving/ copying a CE project folder from 1 computer to another : does this operation will make me change the paths for objects and textures in rules ?
If I apply a rule which was made on 1st computers on the 2nd will work? ( I mean if it will appears unknown textures etc? )
You should only worry about this if you use rules from another project. In that case, the new workspace will need a copy of the other project whose rules are referenced. And that referenced project will need the same project name in the new workspace. Otherwise you must change the paths to the rules.