First, Extract the Safari.cab into a folder. The Safari.cab is from Safari.msi of SafariSetup.exe, you can open the .exe and .msi by using 7-zip tool. :D
Second, put the file into the right folder. If you have MinGW or Cygwin, you can use this script to move all the files into the right folder.
for i in *; do fp=${i//_/\/}; echo $fp; f=$(basename $fp); eval "p=\${fp%$f}"; if [ $fp != $f ];then if [ ! -d $p ];then mkdir -p $p; fi; mv $i $fp; fi; done
Now ready to go! Safari4 beta is a green software.