18.104.22.168 Link Storage (LNK...)
An instance of the Link Storage specifies a linked OLE object and any default data or presentation caching established for it.
The name of this storage MUST be "LNK" followed by eight hexadecimal digits uniquely identifying the linked object. An object persisted in a Link Storage MUST have a corresponding Obj (section 2.4.181) in a worksheet substream (section 22.214.171.124.5), macro sheet substream (section 126.96.36.199.4), or dialog sheet substream (section 188.8.131.52.2) with a cmo.ot field that equals 8, a pictFlags.fPrstm field that equals 0, and a pictFlags.fDde field that equals 1. Additionally, the pictFmla.fmla field of the Obj record (section 2.4.181) specifies a formula that refers to an ExternName (section 2.4.105) with a body field of type ExternOleDdeLink (section 2.5.107) with a lStgName field that specifies the name of the Link Storage that is associated with that Obj record.