Override PartNames are not absolute paths

[martinweismann]

The PartName of the Override in the [Content_Types].xml for the Secure Content extension is missing a leading forward slash.

Is

<?xml version="1.0" encoding="utf-8"?>
<Types xmlns="http://schemas.openxmlformats.org/package/2006/content-types">
	<Default Extension="model" ContentType="application/vnd.ms-package.3dmanufacturing-3dmodel+xml"/>
	<Override PartName="Secure/keystore.xml" ContentType="application/vnd.ms-package.3dmanufacturing-keystore+xml"/>
</Types>

Should:

<?xml version="1.0" encoding="utf-8"?>
<Types xmlns="http://schemas.openxmlformats.org/package/2006/content-types">
	<Default Extension="model" ContentType="application/vnd.ms-package.3dmanufacturing-3dmodel+xml"/>
	<Override PartName="/Secure/keystore.xml" ContentType="application/vnd.ms-package.3dmanufacturing-keystore+xml"/>
</Types>