put it in : C:\Users\"your user name"\Documents\Neverwinter Nights\hak
It will only work when building a new module (and you add the hak to it) though.
It's not something that automatically will appear in the official campaigns or modules without this hak.

Where do the rest of the files go?

https://psteamcommunity.yuanyoumao.com/sharedfiles/filedetails/?id=1309774090

引用自 GoingBatty：

Where do the rest of the files go?

That depends depends on the type. I need more info to be able to answer your queestion.

The guide link I posted above gives comprehensive information on where each file goes.

Note that the CCC is a resource for builders. It assumes you know how to build a module and integrate custom content (if not, get the Toolset Manual volume 1 and 2 and the Custom Content Guide from the Vault).

CCC is generally published as two archives. In theory, the only one you need is the .hak. Adding that file to your module will give you the custom content.

The other archive ("Source") gives you all the files submitted, organised by author. These are pretty much the same files as you already have in the hak, plus any demo modules and help files that the authors provided. You don't necessarily need any of these files. They are only there in case you want to build your own .hak from the source files, see the demos, or understand more about the authors' intentions.

Is the kitsune a npc or a pc? I want to play as a nine tailed kitsune!

引用自 GoingBatty：

Is the kitsune a npc or a pc? I want to play as a nine tailed kitsune!

Just looking at it by default they are npcs. Though with a bit of effort one could probably make them as a playable race for mods.