The runPoint command is what produces data files, not runTrajectory.
File name example : APR13[025].SA2_STK_[P165] //NG7
The last [[A-Z]###] is represented by 4char format, [A000-Z999] - 26,000 permutations before it rolls. Also the number after the date can only be between [0-999]. This functionality is handled by the SANS Data writer. It will rely on expPointNum, instFileNum, and filePrefix.