Small command-line program used to unpack or repack(still beta) unity3d files. This program requires a good amount of memory when decompressing and compressing the files. Download!
When repacking file in a sub directory. (E.g: root/resources/unity_built_in_extra). You will have to copy the file(in my case unity_built_in_extra) and paste it in the root directory and replace the '/' by '!'.
(E.g: root/resources!unity_built_in_extra)
The program will automatically replace the '!' by a ''.