COM Structured Storage
Structured storage is widely used in Microsoft Office applications , although newer releases ( starting with Office 2007 ) use the XML-based Office Open XML by default . 
<triplet> Microsoft Office <subj> Office 2007 <obj> has edition or translation <subj> Office Open XML <obj> readable file format <triplet> Office 2007 <subj> Microsoft Office <obj> subclass of <triplet> XML <subj> Office Open XML <obj> used by