2.1.7.3 Attached Toolbars
An instance of the Attached Toolbars part type specifies the custom toolbars attached to the file.
Content type: application/vnd.ms-excel.attachedToolbars
Source relationship: http://schemas.microsoft.com/office/2006/relationships/attachedToolbars
The internal structure of this part is the same as the structure of the XCB binary stream specified in [MS-XLS] section 2.1.7.10.
An Attached Toolbars part MUST be the target of an implicit relationship from the workbook (section 2.1.7.61) part.
An Attached Toolbars part MUST NOT have implicit or explicit relationships to any part specified in this document.