Strange Behavior of TeXWorks typesetting

I have just downloaded the 64-bit version of MiKTeX.   Using the 
accompanying TeXWorks I enountered the following behavior:

              Typesetting a  tex file with  pdflatex via TeXWorks 
produces a  dvi file.

              Typesetting the same file tex file with XeLaTeX via 
TeXWorks produces a pdf  file.

This is counterintuitive and, of course, just opposite of how my earlier 
installations of MiKTeX behave.   What is the fix?

Thanks,

George McNulty


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