If Type is ExternalLinkType::EXTERNAL
, this member shall contain a string with the
URI of a document. The formula that would need this
information for example would contain =[1]Sheet1!A1 or
='[1]Sheet name'!A1 where [1] does resolve to
the URI contained in the member Data. Note that the
quotes cover both, the document name and the sheet name.
If Type is ExternalLinkType::DDE,
this member shall contain a DDELinkInfo describing
service name, topic, and all known items of a DDE link.
