diff --git a/Classes/PHPExcel/Cell.php b/Classes/PHPExcel/Cell.php
index 94fff47..454de21 100644
--- a/Classes/PHPExcel/Cell.php
+++ b/Classes/PHPExcel/Cell.php
@@ -232,6 +232,8 @@ class PHPExcel_Cell
 	{
 		// set the value according to data type
 		switch ($pDataType) {
+			case PHPExcel_Cell_DataType::TYPE_STRING2:
+				$pDataType = PHPExcel_Cell_DataType::TYPE_STRING;
 			case PHPExcel_Cell_DataType::TYPE_STRING:
 			case PHPExcel_Cell_DataType::TYPE_NULL:
 			case PHPExcel_Cell_DataType::TYPE_INLINE:
@@ -343,6 +345,9 @@ class PHPExcel_Cell
 	 */
 	public function setDataType($pDataType = PHPExcel_Cell_DataType::TYPE_STRING)
 	{
+		if ($pDataType == PHPExcel_Cell_DataType::TYPE_STRING2)
+			$pDataType = PHPExcel_Cell_DataType::TYPE_STRING;
+
 		$this->_dataType = $pDataType;
 
 		return $this->notifyCacheController();
diff --git a/Classes/PHPExcel/Cell/DataType.php b/Classes/PHPExcel/Cell/DataType.php
index 944dba9..7ee47e2 100644
--- a/Classes/PHPExcel/Cell/DataType.php
+++ b/Classes/PHPExcel/Cell/DataType.php
@@ -36,6 +36,7 @@
 class PHPExcel_Cell_DataType
 {
 	/* Data types */
+	const TYPE_STRING2		= 'str';
 	const TYPE_STRING		= 's';
 	const TYPE_FORMULA		= 'f';
 	const TYPE_NUMERIC		= 'n';
diff --git a/Classes/PHPExcel/Writer/Excel2007/StringTable.php b/Classes/PHPExcel/Writer/Excel2007/StringTable.php
index 05e9da5..859cb7e 100644
--- a/Classes/PHPExcel/Writer/Excel2007/StringTable.php
+++ b/Classes/PHPExcel/Writer/Excel2007/StringTable.php
@@ -66,7 +66,7 @@ class PHPExcel_Writer_Excel2007_StringTable extends PHPExcel_Writer_Excel2007_Wr
 	        		!isset($aFlippedStringTable[$cell->getValue()]) &&
 	        		!is_null($cell->getValue()) &&
 	        		$cell->getValue() !== '' &&
-	        		($cell->getDataType() == PHPExcel_Cell_DataType::TYPE_STRING || $cell->getDataType() == PHPExcel_Cell_DataType::TYPE_NULL)
+	        		($cell->getDataType() == PHPExcel_Cell_DataType::TYPE_STRING || $cell->getDataType() == PHPExcel_Cell_DataType::TYPE_STRING2 || $cell->getDataType() == PHPExcel_Cell_DataType::TYPE_NULL)
 	        	) {
 	        			$aStringTable[] = $cell->getValue();
 						$aFlippedStringTable[$cell->getValue()] = 1;