Figured it out! Apparently, the format of the command line must match exactly what is specified in the instructions. Thus
"C:\Program Files\DirectRT\executeDRT.exe" ,1,1,C:/gnat/gnat1.csv,all
Will run but will not use the style file and will not store the data file, but when corrected like this, it will:
"C:\Program Files\DirectRT\executeDRT.exe" /1,1,C:\gnat\gnat1.csv,all
Thanks for you help.