appending a trajectory

Dear all,

i want to concatenate two trajectories. these are created with the reaction preview tool.

Doing something like

my \\\$one = \\\$Documents{"part1.xtd"};
my \\\$two = \\\$Documents{"part2.xtd"};

\\\$one->Trajectory->AppendFramesFrom(\\\$two->Trajectory);

makes MS crash.

Documentation says that with AppendFramesFrom and InsertFramesFrom, Frames can only be inserted into a trajectory with a TrajectoryType of trj. How do I convert trajectory files to trj?

thanks!

Martin