> How can i enable all of the levels in skirmish play in C&C Renegade ?

> And

> Are they some editable settings in C&C:Tiberian Dawn (rules, arts, ais, and so on......)?

yes there are some things you can edit, but it's been so long since I had the game on my machine I can't remember any of it. And I'm afraid I can't reinstall it as I'm now using Win XP and it's a DOS game!
There is definately something like a rules.ini file, I'm sure of that.

Try looking at other sites, like http://cc.ww-underground.com which concentrate on C&C 1