Run the scripts under linux or cygwin.

Extract
- Run ./extract.sh "dso3kb_MyPackage.upk"
- It will decrypt and extract everything into "MyPackage" folder.

Build
- Run ./build.sh "MyPackage", where MyPackage is a folder containing the "update" folder.
- It will compress, encrypt and create "dso3kb_MyPackage.upk" file