The white paper found at http://community.landesk.com/support/docs/DOC-1570 is old but is still valid. By reading through the white paper you should be able to learn how to adjust the inventory scanner to look for the defined file type for the lotus notes archive.
Do you mean just look for all files with a certain file extension? If so, then edit the ldappl3.template file on your core server and add that to the MacScanExtensions= section. The default scan mode for MAC is Mode=All anyway so this should return all files with the specific extensions.
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