This week's book giveaway is in the OCPJP forum. We're giving away four copies of OCA/OCP Java SE 7 Programmer I & II Study Guide and have Kathy Sierra & Bert Bates on-line! See this thread for details.
Don't know what "-Xrunprog" does; do you mean "-Xrunprof"?
But in any case, the -classpath never refers to DLL files; it can refer to jar files, or to directories. You need to have a closer look at whatever documentation you got this "-Xrunprog" from, and see if you've read it correctly.