The information in this topic applies only to System Center 2012 SP1.
An add-in package is just a ZIP file that contains the add-in manifest and any other required files, such as .NET assemblies referenced by the manifest.
To create an add-in package
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Use an archive program that can create ZIP archives.
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Add the manifest.xml file to the ZIP archive.
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Add all files that your add-in depends on to the ZIP archive.
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Optionally, add any PDB files for debugging to the ZIP archive.
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Save the ZIP file, the name of the file is not important but it should end with .ZIP.