2.1.1831 Part 4 Section 19.2.2.17, LinkType (Embedded Object Alternate Image Request)
a. The standard does not specify a default value for the LinkType element.
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Office uses a default value of Bitmap for the LinkType element.
b. The standard indicates how the LinkType element is used.
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n Office, the LinkType element only works for linked objects, which are objects for which the value of the Type attribute on the OLEObject element is Link.