Hi friend I done all as you suggested-When you return on the main window, clic
Engine/ Manage / Details
Select a Engine on the left list.
On this new window, clic on the tab BOOKS
On the little window Arena Engine Book,with the mini icone folder on the right, Search on your computer a book in .abk (normaly you have to put them in a folder Book in Arena main Folder)
Ok ? (I hope...)
Then : Open/Apply (on the bottom)/Start Engine (on the top)
Know, if you play with this engine, it will be OK.
;) One thing could you guide me sir, Use Arena mainbooks with this engine option I have to put right or put blank .Thanks