When creating a SCO there must be a imsmanifest.xml file in the root of the folder. The name of the file cannot be changed and it must follow a specific format. I've created a commented example imsmanifest.xml file based on the example from http://scorm12.com. The file can be downloaded by right clicking and saving the file from here.
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SCORM
In order to get your SCORM package or SCO into the Desire2Learn LMS you must be an instructor and have a course created. Once in your course select 'Content' from the top navigation bar. Then under 'Content Areas' select 'Manage Files'. Under 'Course Admin Tools' select 'Import/Export/Copy Components'. Check 'Import Components' and 'from a File'. Select your zipped up SCO. Hit 'Next'. After it reads the package, hit 'Next' again
a list of useful scorm 1.2 functions all in one place