Two key witnesses in the terror attack probe were found with a computer file labeled "killpresidentbush.exe" and documents linked to a money launderer for Osama Bin Laden, sources told the Daily News. The witnesses were identified as Saudi nationals who tried to board a flight from Kennedy Airport to Los Angeles two days after the Sept. 11 World Trade Center attack, a source familiar with the federal investigation confirmed. Their names remain secret. The two are among a group of 10 material witnesses now in custody in the FBI's probe of the attack on the World Trade Center and the ...