Several reasons :
- It's just better. It achieves a better compression ratio than all the other formats you mentioned. Our website is hosted on a shared server with a pretty low space quota (120 MiB if I remember well), so every byte counts.
- It's open source. WinZIP and WinRAR aren't and aren't even free of charge (I don't know more details about the license to make a program supporting their compression formats though).
- If nobody starts using it, it will remain an "obscure file format"... so someone has to start, and...
- ...anyway, it's not obscure since it was a winner in the
SourceForge.net Community Choice Awards 2007 in two categories
And also a bad reason :unsure: :
- 7-Zip is the only file archiver I have, and I don't want to install another one (and no, I won't use Windows's zip compression)
NB : some file archivers with 7-Zip full support :
- Windows :
IZArc- Mac :
EZ 7z, BetterZip (sharware)
- Linux :
p7zipNB2 : if you don't want to install it, you can use the no-installation unpacker we made, here :
http://www.patheticcockroach.com/mpam4/index.php?p=61&id=24