On Apr 27, 2009, at 18:55 , Vasili I. Galchin wrote:

createProcess expects a list of individual argument strings.  You're sending it a single argument ["-p blastn"]; you want to send it two arguments ["-p", "blastn"] (or ["-pblastn"] without the space; like most commands you can combine the parameter with the option or pass it as the next argument).