The Timmins Storm file would not be a mass storm file like the mass storms for the SCS and Chicago storms. This is a historical storm. The mass storms are used to refine say the 24-hour SCS with a rainfall depth specific to your particular area.
I'm not entirely certain about the coding within VO2, however, I believe you can create a .txt of .dat that you can read into VO2. Check the reference manual on how to do this accuratley.
Hope this helps.