How to output bead force during the DPD simulation?

Hello,

I want to use the perl script function to output the force on each of the beads in a polymer system. I conducted Mesocite DPD simulation on the model and have got the final .xsd file and the .xtd trajectory file now. However, I found that the .xsd file gives bead force, but the .xtd file do not. As the following picture shows. How can I get the force on each of the bead in the .xtd trajectory file using perl script?
Here are some screenshot of my software: (1) bead property in the final .xsd file; (2) bead property in the .xtd file. 
(1)User-added image(2)User-added image

Thank you very much.
zhikun