COCKPIT WINDOW COMES OPEN ON TKOF ROLL. TKOF ABORTED.

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ON TKOF AT BWI I HEARD WHAT SOUNDED LIKE AN AIR LEAK COMING FROM THE VICINITY OF MY SLIDING WINDOW. AT APPROX 60 KTS IT POPPED OPEN (INWARD ABOUT 1-2 INCHES) BUT DID NOT SLIDE BACK. I REACHED OVER WITH MY L HAND AND OPENED THE LATCH AND WITH MY R HAND ATTEMPTED TO RECLOSE THE WINDOW. AT THE SAME TIME THE CAPT REJECTED THE TKOF. THE TKOF WAS REJECTED AT APPROX 65-70 KTS IN MY ESTIMATION. ALL PREFLT CHKS AND CHKLISTS WERE ACCOMPLISHED. THE WINDOW APPEARED SHUT AS PER ACR PROCS. IT TOOK 1-2 ROTATIONS OF THE CRANK TO RECLOSE THE WINDOW. WE WERE BOTH SATISFIED THAT THERE WAS NO SYS FAULT. CONTRIBUTING FACTORS: WHEN WE ACCOMPLISHED OUR PREFLT PANEL SCAN; MOST SWITCHES WERE IN THE WRONG POS FOR FLT AS MAINT PERSONNEL HAD OBVIOUSLY ACCOMPLISHED THEIR CHKS THE PREVIOUS NIGHT. THE COCKPIT WINDOWS BY ACR POLICY ARE NOT TO BE OPENED EXCEPT IN EMER. IT IS MY BELIEF THAT MAINT HAD OPENED AND NOT FULLY OR CORRECTLY CLOSED THE WINDOW AS IT APPEARED CLOSED BUT WAS OBVIOUSLY NOT LATCHED CORRECTLY. OUR WAKEUP AT THE OVERNIGHT HOTEL WAS XC30 BODY CLOCK TIME FOR AN XA35 DEP.