[ShadowChemosh]

You can't change the core skeleton files of a game system. The editor does let you make a copy of anything and then you can change it or use the information to make your own stuff. Say you want your own custom house rules for say Half-Orc. You make a copy of Half-Orc and then tell it to replace the core Thing (ie Half-Orc). So from then on the Half-Orc available is your custom version.

So not only can you create new stuff, but you can change existing stuff. The idea is that you don't directly change the CORE/Skeleton system, but instead just tell HL to use your new thing instead. In this way if you simply removed all your .user file (ie custom changes) you would be right back to the CORE system. Really nice when starting out as you can't damage the core game system.

Now Data Add on packages can not be easily copied, but you can still view them and use the info to re-create the whole thing again if you wish.

Over all it works really well and I have lots of changes and new things for my own games house rules file. Then I can just package up those .user files and when loaded on to my players HL they get to use all the stuff I created or changed.

Hope that helps.