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The Data Transformation Services (DTS) package file format is based on the Compound File Binary file format that is defined in [MS-CFB].
The DTS file format provides for a directory stream and several storages. Each storage object represents one package. Each package, in turn, has its own directory stream object that can contain multiple storage objects. Each storage represents a single version of the package. Each version contains either an encrypted storage (if the DTS task or DTS transformation supports the IPersistStorage interface) or an encrypted stream with the persisted information (either the IPersistPropertyBag interface or the default PropertiesProvider method) for the version.