".gz" files

I need some help. Jay West has kindly posted the file "rt11freewarev2.iso.gz" at: http://www.classiccmp.org/PDP-11/RT-11/freeware-CDS/images/ "rt11freewarev2.iso.gz" is about 171 Mbytes in size. It is my understanding that the full size file "rt11freewarev2.iso" is exactly 671,088,640 bytes in size which is the CD for the RT11 Freeware CD produced by Tim Shoppa. However, when the download of the "rt11freewarev2.iso.gz" file is complete, I end up with a file that is 687,282,673 bytes which is different in size and can NOT be identical to the full size (and correct - Tim Shoppa used to have the full size image at his site and I downloaded it before it was changed to a ".bz2" image) image of the actual CD. I am using Windows 98 SE/Netscape 4.78 and the normal WinZip in case that is part of the problem. Jay has told me: "I spent about 6 hours this morning redownloading (from Tim's site) all 3 freeware cd's, uncompressing them, recalculating MD5 hashes, and rezipping them. The files I just downloaded compare identically with the files on Tim's site, AND those files compare identically to the files I have had on my server for the past few weeks that you already downloaded. I even downloaded those files from my server to my windows pc across the net like everyone else would, and they uncompress and compare identially to the ones on Tim's site. The files on my server have been completely correct since day 1. I don't know what happened on your end when you downloaded the files, but I can assure you what is (and has been) on my site is a correct identical copy of Tim's." I am confident that Jay is correct and that there is something I don't understand with what takes place when I do my download. Can anyone suggest to me what I am doing wrong? PLEASE!! Sincerely yours, Jeremy Fine -- If you attempted to send a reply and the original e-mail address has been discontinued due a high volume of junk e-mail, then the semi-permanent e-mail address can be obtained by replacing the four characters preceding the 'at' with the four digits of the current year.