The log output from zipper.exe and unpack200.exe is lost and not available for troubleshooting reports of Error 1722.
The LOGFILE property is not set during install for zipper.exe and unpack200.exe.
The log file is passed as an empty quoted string:
zipper.exe "C:\Program Files\Java\jre6\core.zip" "C:\Program Files\Java\jre6\" ""
unpack200.exe -r -v -l "" "C:\Program Files\Java\jre6\lib\rt.pack" "C:\Program Files\Java\jre6\lib\rt.jar"