Iphone packager package size issue

I develop a lot of applications for IOS, i have Apple SDK and Flex Builder, i know very well environnement and there is something very strange.

consider i optimize code (asset, release,...)

IPA 8.25Mo

File in store 20.1Mo

i get zip from store with itunes (select application)

i unzip the file 22.3 Mo

a lot of localisation files (400ko), some files tiny size

i detect very curious thing

in the payload/BundleName.app you should detect a file with the name of your application and in my case 19.7Mo it is the application generated by Adobe

in the IPA from Adobe this file have a compress ration very good ratio (7Mb) is why you see an acceptable size.

in the IPA i download from Apple, the same file have a very bad compress ratio so in the zip from apple it is 18Mo

Adobe should give explaination on this parameters that is very important.

may be those informations could contribute

The IPA that Flash makes is a zip file. The one that iTunes uses is an archive of the uncompressed files. That's why it's bigger.

I didn't think FB 4.6  update was released yet...