Symptom:

After installing SharePoint Learning Kit successfully, (http://www.codeplex.com/SLK), everything works except that the SCORM package (a ZIP extension) is opening as a ZIP file instead of a course. You get the normal ZIP message "Do you want to open or save this file?"

Problem:

The package is zipped at the upper folder level and does not create a manifest that allows SharePoint to recognize it as a SCORM file instead of a ZIP file.

Solution:

Add the contents of the course to the ZIP, not the outer (uppermost) folder.  This creates a ZIP file that SharePoint can recognize as a SCORM package.