Active-X in OOXML documents

[MURATA Makoto (FAMILY Given)]

Dear colleagues,

Do OOXML documents contain ActiveX programs only when OPC parts of the
type "application/vnd.ms-office.activeX+xml" exist?  If this is the case, we
can claim that macro-free OOXML documents are also ActiveX free and thus
safe when "application/vnd.ms-office.activeX+xml" does not appear in
[Content_Types].xml.

Cheers,
Makoto