2.1.527 Part 1 Section 17.17.2.1, altChunk (Anchor for Imported External Content)
a. The standard states that the relationship type is http://schemas.openxmlformats.org/officeDocument/2006/relationships/afChunk.
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Word uses the relationship type defined in Alternative Format Import Part ("[ISO/IEC-29500-1] §11.3.1"): http://schemas.openxmlformats.org/officeDocument/2006/relationships/aFChunk.
b. The standard specifies that applications can support any set of content types.
Word supports the following content types:
application/vnd.openxmlformats-officedocument.wordprocessingml.document.main+xml
application/vnd.ms-word.document.macroEnabled.main+xml
application/vnd.openxmlformats-officedocument.wordprocessingml.template.main+xml
application/vnd.ms-word.template.macroEnabledTemplate.main+xml
message/rfc822
application/xml
application/rtf
application/xhtml+xml
text/html
text/plain