You shouldn't have to use Winzip, it probably popped up because you have that installed on your system as the default file extractor. All Window's OS's since 98 SE have a built in utility to decompress a zip file, and Mac users have a similar program. Those instructions are listed on the down load page. It is just a matter of 2 extra clicks.
The reason I want to archive them is for space, and better organization. Once a volume is completed I'm going to compress all those issues into one or two files. It is much easier to manage, rather then the have a long list of individual files.
Edited for grammatical corrections - I'll blame in on the spell checker
