Toad10.1 problem: Editor does not support PKB and PKS extensions

I went to options è behaviour è pl/sql è general tab

And confirmed that PKB and PKS are in the extensions box

But when I try to compile a PKS file the the EXECUTE AS SCRIPT is greyed out,
the F5 does nothing and when I try the EXUTE (F9) button I get a quick DOS
window that pos up and disappears immediately. The same problem for PKB. I can
save it as a .SQL file. Close the tab and open the SQL file and it works.

How can I get 10.1 to accept PKS and PKB files?