Hello larason2,
As well as having the correct file extension ('.CompPkg_Hauptwerk_rar'), the RAR-created files must also have the correct folder structure within them, with the one or more of the following folders at the top level in the RAR:
OrganDefinitions
OrganInstallationPackages
Temperaments
ImpulseResponseReverbs
If you have the 'Hauptwerk sample set creator utilities' licence option in iLok, then the 'Design tools | View organ definition format documentation' menu option will be present, which has the necessary information. (If you don't have that, then please email Francois at support [at] hauptwerk.com to get it, as well as the sample set creator's guide (which also covers the need to obtain appropriate unique OrganIDs, InstallationPackageIDs, etc. to allow for public distribution).