I have it jolly well in C:\ruby\lib\ruby\gems\1.8\gems\rubyzip-0.9.1
Now in irb i get
C:\ruby>irb
irb(main):001:0> require ‘rubyzip’
LoadError: no such file to load – rubyzip
from c:/ruby/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:
27:in ge m_original_require' from c:/ruby/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb: 27:inre
quire’
from (irb):1
irb(main):002:0>