diff --git a/xlsx/scripts/office/schemas/ISO-IEC29500-4_2016/shared-documentPropertiesExtended.xsd b/xlsx/scripts/office/schemas/ISO-IEC29500-4_2016/shared-documentPropertiesExtended.xsd
new file mode 100644
index 0000000..a181281
--- /dev/null
+++ b/xlsx/scripts/office/schemas/ISO-IEC29500-4_2016/shared-documentPropertiesExtended.xsd
@@ -0,0 +1,38 @@
+<?xml version="1.0" encoding="utf-8"?>
+<xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema"
+ xmlns="http://schemas.openxmlformats.org/officeDocument/2006/extended-properties"
+ targetNamespace="http://schemas.openxmlformats.org/officeDocument/2006/extended-properties"
+ elementFormDefault="qualified">
+ <xsd:element name="Properties" type="CT_Properties"/>
+ <xsd:complexType name="CT_Properties">
+  <xsd:sequence>
+   <xsd:element name="Template" type="xsd:string" minOccurs="0"/>
+   <xsd:element name="Manager" type="xsd:string" minOccurs="0"/>
+   <xsd:element name="Company" type="xsd:string" minOccurs="0"/>
+   <xsd:element name="Pages" type="xsd:int" minOccurs="0"/>
+   <xsd:element name="Words" type="xsd:int" minOccurs="0"/>
+   <xsd:element name="Characters" type="xsd:int" minOccurs="0"/>
+   <xsd:element name="PresentationFormat" type="xsd:string" minOccurs="0"/>
+   <xsd:element name="Lines" type="xsd:int" minOccurs="0"/>
+   <xsd:element name="Paragraphs" type="xsd:int" minOccurs="0"/>
+   <xsd:element name="Slides" type="xsd:int" minOccurs="0"/>
+   <xsd:element name="Notes" type="xsd:int" minOccurs="0"/>
+   <xsd:element name="TotalTime" type="xsd:int" minOccurs="0"/>
+   <xsd:element name="HiddenSlides" type="xsd:int" minOccurs="0"/>
+   <xsd:element name="MMClips" type="xsd:int" minOccurs="0"/>
+   <xsd:element name="ScaleCrop" type="xsd:boolean" minOccurs="0"/>
+   <xsd:element name="HeadingPairs" type="CT_VectorVariant" minOccurs="0"/>
+   <xsd:element name="TitlesOfParts" type="CT_VectorVariant" minOccurs="0"/>
+   <xsd:element name="LinksUpToDate" type="xsd:boolean" minOccurs="0"/>
+   <xsd:element name="CharactersWithSpaces" type="xsd:int" minOccurs="0"/>
+   <xsd:element name="SharedDoc" type="xsd:boolean" minOccurs="0"/>
+   <xsd:element name="HyperlinksChanged" type="xsd:boolean" minOccurs="0"/>
+   <xsd:element name="AppVersion" type="xsd:string" minOccurs="0"/>
+  </xsd:sequence>
+ </xsd:complexType>
+ <xsd:complexType name="CT_VectorVariant">
+  <xsd:sequence>
+   <xsd:any namespace="##any" processContents="lax" minOccurs="0" maxOccurs="unbounded"/>
+  </xsd:sequence>
+ </xsd:complexType>
+</xsd:schema>