Extract a document either from an index or from a container

(1) When a document is cached in the index, extract it without performing any conversion. Must be combined with dtsConvertGetFromCache, and the OutputFile must be set to the name of the file to write the result to (output cannot be directed to memory). (2) When a document is stored in a container file format such as a PST archive, extract it without performing any conversion. OutputFile must be set to the name of the file to write the result to (output cannot be directed to memory).