How to Permanently Delete Default Content Manager Categories?

Hello. When somone has a moment, do you know how to permenently delete the sub-categories of the "Default" directory under the content manager categories? I use Daz 4.5.1.6 and every time I manually delete sub-categoreis such as "accessories," "anatomy," "animals," etc, they keep coming back after I restart Daz Studio.
-Joe
Comments
AFAIK you can't. I set up my own categories outside of Default, and leave Default for metadata.
Redacted
Interesting, cridgit, thanks for the info. I assume that if you already have items installed in some of those categories, they'll still be there even if you remove the categories from rootcategories.txt
Also, if you install an update to DS, it will overwrite the altered file with the default one. The easiest way around that is to keep a copy of the edited file elsewhere...then just drop a copy of it over the 'default' file after the update.
You can add your own categories to the file making them 'defaults', too.
There's other fun things you can do by hacking the files in the resources folder (up to an including 'breaking' DS so it won't run...so keep backup copies of those files).
@cridgitThanks for the help! Exactly the answer I was lookiing for.