hi guys, i use ionic.zip.dll in my project,i drop this file to assets and this work great in my project.but when i build this is not work 
my build is for windows with .Net 2.0 and .Net 2.0 subset but does not work
what can i do for this problem, thanks in advance
okay very nice my problem was solved 
unity show this error:
ArgumentException: Encoding name ‘IBM437’ not supported
for solve this problem i copy all I8N*.dll from Unity installation
C:\Program Files\UnityEditor\Data\Mono\lib\mono\unity to the
Assets folder of your project.
very nice