or download this
C:\_32>perl -MPOSIX -le "print scalar reverse unpack 'h*', pack 'd<',
+POSIX::strtod('-8.2727285363069939e-293');"
834a6aec8f941351
C:\_32>perl -MPOSIX -le "printf '% 25.17g', POSIX::strtod('-8.27272853
+63069939e-293');"
-8.2727285363069939e-293