Windows users who want to explore the generated machine code need to download the following files and put them in this directory: objdump.exe: http://cvs.sourceforge.net/viewcvs.py/psyco/psyco/py-utils/win32/objdump.exe?rev=1.1&view=auto cygwin1.dll: http://cvs.sourceforge.net/viewcvs.py/psyco/psyco/py-utils/win32/cygwin1.dll?rev=1.1&view=auto Both are GPL software distributed (with source) in Red Hat's Cygwin (http://www.redhat.com/software/cygwin/). For more information on exploring the machine code see the top-level README.TXT file.