script to extract only one freearc archive

[Newbie-repacker]

Hi forum members.......
i came here from krinels

So what i wanted is ......
I want to make a script which can extract only one freearc archieve (whose name i can change in script).......
The script should be simple.....Just select the dir and extract......
Moreover what i need main is that i can add custom unpacking tools
like rz xtool nanozip,etc....

Actually am working on this from past 3 weeks, but since am new in this field i dont have much knowledge......

Is anyone ready to help me

THANKS IN ADVANCE