REGEDIT4 

[HKEY_CLASSES_ROOT\Drive\shell\rxvt]
@="&Cygwin bash/RXVT Here"

[HKEY_CLASSES_ROOT\Drive\shell\rxvt\command]
@="C:\\cygwin\\bin\\rxvt.exe -bg black -fg white -sr -sl 1000 -fn \"Fixedsys\" -ls -e /usr/bin/bash --login -c \"cd '%1'; exec /bin/bash -rcfile ~/.bashrc\"" 

[HKEY_CLASSES_ROOT\Directory\shell\rxvt]
@="&Cygwin bash/RXVT Here"

[HKEY_CLASSES_ROOT\Directory\shell\rxvt\command]
@="C:\\cygwin\\bin\\rxvt.exe -bg black -fg white -sr -sl 1000 -fn \"Fixedsys\" -ls -e /usr/bin/bash --login -c \"cd '%1'; exec /bin/bash -rcfile ~/.bashrc\""


[HKEY_CLASSES_ROOT\Drive\shell\BashHere]
@="&Cygwin bash/CMD Here"

[HKEY_CLASSES_ROOT\Drive\shell\BashHere\command]
@="c:\\cygwin\\bin\\bash.exe --login -c \"cd '%1' ; exec /bin/bash -rcfile ~/.bashrc\""

[HKEY_CLASSES_ROOT\Directory\shell\BashHere]
@="&Cygwin bash/CMD Here"

[HKEY_CLASSES_ROOT\Directory\shell\BashHere\command]
@="c:\\cygwin\\bin\\bash.exe --login -c \"cd '%1' ; exec /bin/bash -rcfile ~/.bashrc\""