Convert a PDF to Postscript using GhostscriptTag(s): Misc Prog HowTo
Ghostscript is an interpreter for the PostScript language and for PDF.
gswin32c.exe -dNOPAUSE -dBATCH -sDEVICE=pswrite -sOutputFile=mydocument.ps mydocument.pdf
gswin32c.exe -dNOPAUSE -dBATCH -sDEVICE=pswrite -sOutputFile=mydocument.ps mydocument.pdf