There is a parameter that I found in an article about configs
http://www.proesite.com/cgi-bin/find_option.cgi?srch=DIM_FRACTION_DENOMINATOR&ver=creo2
I am not sure what your default value is.
This was a link Antonius shared that all the config.pro options for Creo2
http://www.proesite.com/UTIL/creo2_allopt.htm
See if this works,
Dale-