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The trick to creating a valid SCORM package zip file is that you DO NOT zip the folder in which the SCORM files and all the Captivate content files have been published.  If you to that, the imsmanifest.xml file that the LMS will be looking for inside the ZIP archive will be one level too far down inside the hierarchy of folders.   When the LMS SCORM API cannot file the manifest, it rejects the zip archive as an invalid SCORM, when the actual problem is that it wasn't correctly compressed.

So what you have to do is GO INSIDE the folder where the published files are located, select ALL files found there, and then (with Winzip) right-click the selected group and choose the menu option to create a single zip archive of all those files.  Give it whatever name you want, but the end result must be that the manifest file is located at the root level of the zip archive.  

Then if you had no problem getting the LMS to accept those files as a valid SCORM file when they were previously zipped, you should be good to go.  When Captivate creates the SCORM zip, it does it this way too.