Exporting .stp file to csv file

Hi,

I am trying to export step file .stp to .csv file for debugging purpose. When I do so, Quartus round off some bus value which make it impossible for me to use the csv file. For example, the bus value 0x123456789ABCDEF0 is round off to 1200000000000000. It only do this to about 10% of the bus values. The rest is fine.

Is there a way to avoid this kind of round off?