188.8.131.52 Excel Attached Toolbars Part
This binary part supports the storage of custom toolbars created by the user.
A package shall contain at most one Attached Toolbars part, and that part shall be the target of an implicit relationship from the Workbook part ("[ECMA-376] Part 1 §12.3.23; Workbook Part").
[Example: The following Workbook part-relationship item contains a relationship to the Attached Toolbars part, which is stored in the ZIP item attachedToolbars.bin:
<Relationships xmlns="…"> <Relationship Id="rId6" Type="http://…/attachedToolbars" Target="attachedToolbars.bin"/> </Relationships>
An Attached Toolbars part shall be located within the package containing the source relationship (expressed syntactically, the TargetMode attribute of the Relationship element shall be Internal).
An Attached Toolbars part shall not have implicit or explicit relationships to any part defined by ECMA-376 Office Open XML File Formats [ECMA-376].
The internal structure of the ZIP item attachedToolbars.bin is specified in the XCB section of the Excel 97-2003 Binary File Format (.xls) Structure Specification [MS-XLS] book.