What was found
AIRCRAFT GROUNDED - ABORTED TAKEOFF - FIRST OFFICER WINDOW FLEW OPEN ON TAKE-OFF AT Z 100 KTS, TAKE-OFF REJECTED, AUTO BRAKES CYCLED. INSPECTED FIRST OFFICER WINDOW ACTUATION MECHANISM PER AMM 56-12-12, ALL CHECKS GOOD. ACCOMPLISHED REJECTED TAKE-OFF INSPECTION PER GPM 11.02 AND TSM 05-50-00-810-825A. NO HISTORY PAST 30 DAYS, AIRCRAFT OKAY TO CONTINUE FLIGHT.