LROs enable you to associate objects, such as flat files, with data cells. Using the Spreadsheet Add-in, users can create and store LRO files, with an .lro extension.
LRO files are stored in the database directory (ARBORPATH/app/appname/dbname; for example, app/Sample/Basic).
Essbase stores information about LROs in an LRO catalog. Each catalog resides in its own Essbase index page and coexists in an index file with other, non-LRO Essbase index pages.
See Linking Objects to Essbase Data and the Oracle Essbase Spreadsheet Add-in User's Guide.