just trying to make sure it is worth our whike doing all the above, what compression rate are u referring to? the compression rates that we are practically accustomed to are reasonably satisfactory - a very good compression rate can be achieved thru winntsetup itself by clicking on the start square icon on the top right corner of the mask and then on "local windows installations", then right-clicking and selecting compact windows, choosing "lzx" and ticking the recompression box below. yet other good compression rates can be achieved thru windows10tweaker.exe from the optimization section (the only inconvenience being with this one here that u cannot do anything while it is compacting as everything freezes till the end of the process). pls try both and compare with ur rar kinda thing for best compression results.