Basically the GibbsCAM pack and go file .GCPKG is a .ZIP file with a different extension.
When you drag and drop these files into an open GibbsCAM windows one of two things happen.
.ZIP
This type will install all the required files permanently into your GibbsCAm environment.
.GCPKG
This type will install the required files temporally into you GibbsCAm environment. If you close GibbsCAm the files are gone.
These files are great for sending us all the data involved in a project you are having issues with. send them to support@camco-ne.com