diff --git a/Common/DocxFormat/Source/XlsxFormat/Styles/NumFmts.h b/Common/DocxFormat/Source/XlsxFormat/Styles/NumFmts.h
index 90232a9ba6..9e68840399 100644
--- a/Common/DocxFormat/Source/XlsxFormat/Styles/NumFmts.h
+++ b/Common/DocxFormat/Source/XlsxFormat/Styles/NumFmts.h
@@ -72,6 +72,7 @@ namespace OOX
 				writer.StartAttributes();
 				WritingStringNullableAttrInt(L"numFmtId", m_oNumFmtId, m_oNumFmtId->GetValue());
 				WritingStringNullableAttrEncodeXmlString(L"formatCode", m_oFormatCode, *m_oFormatCode);
+				WritingStringNullableAttrEncodeXmlString(L"x16r2:formatCode16", m_oFormatCode16, *m_oFormatCode16);
 				WritingStringNullableAttrBool(L"sourceLinked", m_oSourceLinked);
 				writer.EndAttributesAndNode();
 			}
@@ -98,6 +99,7 @@ namespace OOX
 			{
 				WritingElement_ReadAttributes_Start( oReader )
 					WritingElement_ReadAttributes_Read_if     ( oReader, _T("formatCode"),		m_oFormatCode )
+					WritingElement_ReadAttributes_Read_if     ( oReader, _T("x16r2:formatCode16"),	m_oFormatCode16 )
 					WritingElement_ReadAttributes_Read_if     ( oReader, _T("numFmtId"),		m_oNumFmtId )
 					WritingElement_ReadAttributes_Read_if     ( oReader, _T("sourceLinked"),	m_oSourceLinked )
 
@@ -117,6 +119,7 @@ namespace OOX
 
 		public:
 			nullable_string									m_oFormatCode;
+			nullable_string									m_oFormatCode16;
 			nullable<SimpleTypes::CUnsignedDecimalNumber<>>	m_oNumFmtId;
 			nullable<SimpleTypes::COnOff<>>					m_oSourceLinked;
 		};
diff --git a/XlsxSerializerCom/Common/BinReaderWriterDefines.h b/XlsxSerializerCom/Common/BinReaderWriterDefines.h
index 2a7a6b1371..6c89b433cf 100755
--- a/XlsxSerializerCom/Common/BinReaderWriterDefines.h
+++ b/XlsxSerializerCom/Common/BinReaderWriterDefines.h
@@ -195,7 +195,8 @@ namespace BinXlsxRW
 	namespace c_oSerNumFmtTypes{enum c_oSerNumFmtTypes
 	{
 		FormatCode = 0,
-		NumFmtId = 1
+		NumFmtId = 1,
+		FormatCode16 = 2
 	};}
 	namespace c_oSerSharedStringTypes{enum c_oSerSharedStringTypes
 	{
diff --git a/XlsxSerializerCom/Reader/BinaryWriter.cpp b/XlsxSerializerCom/Reader/BinaryWriter.cpp
index 05fe7bddc7..b11d209a4e 100644
--- a/XlsxSerializerCom/Reader/BinaryWriter.cpp
+++ b/XlsxSerializerCom/Reader/BinaryWriter.cpp
@@ -1663,6 +1663,16 @@ void BinaryStyleTableWriter::WriteNumFmt(const OOX::Spreadsheet::CNumFmt& numFmt
 		if(NULL != m_pEmbeddedFontsManager)
 			m_pEmbeddedFontsManager->CheckString(sFormatCode);
 	}
+	if(numFmt.m_oFormatCode16.IsInit())
+	{
+		std::wstring& sFormatCode = *numFmt.m_oFormatCode16;
+		m_oBcw.m_oStream.WriteBYTE(c_oSerNumFmtTypes::FormatCode16);
+		m_oBcw.m_oStream.WriteBYTE(c_oSerPropLenType::Variable);
+		m_oBcw.m_oStream.WriteStringW(sFormatCode);
+
+		if(NULL != m_pEmbeddedFontsManager)
+			m_pEmbeddedFontsManager->CheckString(sFormatCode);
+	}
 	//NumFmtId
 	if(numFmt.m_oNumFmtId.IsInit())
 	{
diff --git a/XlsxSerializerCom/Writer/BinaryReader.cpp b/XlsxSerializerCom/Writer/BinaryReader.cpp
index df06ff7435..77aa8857c9 100644
--- a/XlsxSerializerCom/Writer/BinaryReader.cpp
+++ b/XlsxSerializerCom/Writer/BinaryReader.cpp
@@ -1672,6 +1672,10 @@ int BinaryStyleTableReader::ReadNumFmt(BYTE type, long length, void* poResult)
 	{
 		pNumFmt->m_oFormatCode = m_oBufferedStream.GetString4(length);
 	}
+	else if(c_oSerNumFmtTypes::FormatCode16 == type)
+	{
+		pNumFmt->m_oFormatCode16 = m_oBufferedStream.GetString4(length);
+	}
 	else if(c_oSerNumFmtTypes::NumFmtId == type)
 	{
 		pNumFmt->m_oNumFmtId.Init();