How to use the zip function for spk files and how to install them?
Script Packages (SPKs) simply provide a way for you to wrap up your Apps (including all the images etc) and transfer them to a friend's phone via email.
If you click on an SPK file in an email message or your downloads folder you should get an option to open it with AndroidScript. It will then be added to your list of Apps.
The SPK file format is simply a zip file format just like APK's are.
I hope that answers your question.
David