diff --git a/Classes/PHPExcel/Reader/Excel2007.php b/Classes/PHPExcel/Reader/Excel2007.php
index 94655a0e..fc055992 100644
--- a/Classes/PHPExcel/Reader/Excel2007.php
+++ b/Classes/PHPExcel/Reader/Excel2007.php
@@ -1193,7 +1193,6 @@ class PHPExcel_Reader_Excel2007 implements PHPExcel_Reader_IReader
 										}
 									}
 								}
-								var_dump($autoFilter);
 							}
 
 							if ($xmlSheet && $xmlSheet->mergeCells && $xmlSheet->mergeCells->mergeCell && !$this->_readDataOnly) {
diff --git a/Classes/PHPExcel/Worksheet/AutoFilter.php b/Classes/PHPExcel/Worksheet/AutoFilter.php
index cb7a1680..f5a48cd9 100644
--- a/Classes/PHPExcel/Worksheet/AutoFilter.php
+++ b/Classes/PHPExcel/Worksheet/AutoFilter.php
@@ -239,6 +239,264 @@ class PHPExcel_Worksheet_AutoFilter
 		return $this;
 	}
 
+	private static function _filterTestInSimpleDataSet($cellValue,$dataSet)
+	{
+		$dataSetValues = $dataSet['filterValues'];
+		$blanks = $dataSet['blanks'];
+		if (($cellValue == '') || ($cellValue === NULL)) {
+			return $blanks;
+		}
+		return in_array($cellValue,$dataSetValues);
+	}
+
+	private static function _filterTestInDateGroupSet($cellValue,$dataSet)
+	{
+		$dateSet = $dataSet['filterValues'];
+		$blanks = $dataSet['blanks'];
+		if (($cellValue == '') || ($cellValue === NULL)) {
+			return $blanks;
+		}
+		if (is_numeric($cellValue)) {
+			$dateValue = PHPExcel_Shared_Date::ExcelToPHP($cellValue);
+			if ($cellValue < 1) {
+				//	Just the time part
+				$dtVal = date('His',$dateValue);
+				$dateSet = $dateSet['time'];
+			} elseif($cellValue == floor($cellValue)) {
+				//	Just the date part
+				$dtVal = date('Ymd',$dateValue);
+				$dateSet = $dateSet['date'];
+			} else {
+				//	date and time parts
+				$dtVal = date('YmdHis',$dateValue);
+				$dateSet = $dateSet['dateTime'];
+			}
+			foreach($dateSet as $dateValue) {
+				//	Use of substr to extract value at the appropriate group level
+				if (substr($dtVal,0,strlen($dateValue)) == $dateValue)
+					return TRUE;
+			}
+		}
+
+		return FALSE;
+	}
+
+	private static function _filterTypeCustomFilters($cellValue,$ruleSet)
+	{
+		$dataSet = $ruleSet['filterRules'];
+		$join = $ruleSet['join'];
+
+		$returnVal = ($join == PHPExcel_Worksheet_AutoFilter_Column::AUTOFILTER_COLUMN_ANDOR_AND);
+		foreach($dataSet as $rule) {
+			if (is_numeric($rule['value'])) {
+				//	Numeric values are tested using the appropriate operator
+				switch ($rule['operator']) {
+					case PHPExcel_Worksheet_AutoFilter_Column_Rule::AUTOFILTER_COLUMN_RULE_EQUAL :
+						$retVal	= ($cellValue == $rule['value']);
+						break;
+					case PHPExcel_Worksheet_AutoFilter_Column_Rule::AUTOFILTER_COLUMN_RULE_NOTEQUAL :
+						$retVal	= ($cellValue != $rule['value']);
+						break;
+					case PHPExcel_Worksheet_AutoFilter_Column_Rule::AUTOFILTER_COLUMN_RULE_GREATERTHAN :
+						$retVal	= ($cellValue > $rule['value']);
+						break;
+					case PHPExcel_Worksheet_AutoFilter_Column_Rule::AUTOFILTER_COLUMN_RULE_GREATERTHANOREQUAL :
+						$retVal	= ($cellValue >= $rule['value']);
+						break;
+					case PHPExcel_Worksheet_AutoFilter_Column_Rule::AUTOFILTER_COLUMN_RULE_LESSTHAN :
+						$retVal	= ($cellValue < $rule['value']);
+						break;
+					case PHPExcel_Worksheet_AutoFilter_Column_Rule::AUTOFILTER_COLUMN_RULE_LESSTHANOREQUAL :
+						$retVal	= ($cellValue <= $rule['value']);
+						break;
+				}
+			} else {
+				//	String values are always tested for equality
+				$retVal	= preg_match('/^'.$rule['value'].'$/',$cellValue);
+			}
+			//	If there are multiple conditions, then we need to test both using the appropriate join operator
+			switch ($join) {
+				case PHPExcel_Worksheet_AutoFilter_Column::AUTOFILTER_COLUMN_ANDOR_OR :
+					$returnVal = $returnVal || $retVal;
+					//	Break as soon as we have a match for OR joins
+					if ($returnVal)
+						return $returnVal;
+					break;
+				case PHPExcel_Worksheet_AutoFilter_Column::AUTOFILTER_COLUMN_ANDOR_AND :
+					$returnVal = $returnVal && $retVal;
+					break;
+			}
+		}
+
+		return $returnVal;
+	}
+
+	private static function _filterTypeDynamicFilters($cellValue,$testSet)
+	{
+		return TRUE;
+	}
+
+	private static function _filterTypeTopTenFilters($cellValue,$testSet)
+	{
+		return TRUE;
+	}
+
+	private static $_fromReplace = array('\*', '\?', '~~', '~.*', '~.?');
+	private static $_toReplace   = array('.*', '.',  '~',  '\*',  '\?');
+
+	/**
+	 *	Apply the AutoFilter rules to the AutoFilter Range
+	 *
+	 *	@throws	PHPExcel_Exception
+	 *	@return PHPExcel_Worksheet_AutoFilter
+	 */
+	public function showHideRows()
+	{
+		list($rangeStart,$rangeEnd) = PHPExcel_Cell::rangeBoundaries($this->_range);
+
+		//	The heading row should always be visible
+		echo 'AutoFilter Heading Row ',$rangeStart[1],' is always SHOWN',PHP_EOL;
+		$this->_workSheet->getRowDimension($rangeStart[1])->setVisible(TRUE);
+
+		$columnFilterTests = array();
+		foreach($this->_columns as $columnID => $filterColumn) {
+			$rules = $filterColumn->getRules();
+			switch ($filterColumn->getFilterType()) {
+				case PHPExcel_Worksheet_AutoFilter_Column::AUTOFILTER_FILTERTYPE_FILTER :
+					$ruleValues = array();
+					//	Build a list of the filter value selections
+					foreach($rules as $rule) {
+						$ruleType = $rule->getRuleType();
+						$ruleValues[] = $rule->getValue();
+					}
+					//	Test if we want to include blanks in our filter criteria
+					$blanks = FALSE;
+					$ruleDataSet = array_filter($ruleValues);
+					if (count($ruleValues) != count($ruleDataSet))
+						$blanks = TRUE;
+					if ($ruleType == PHPExcel_Worksheet_AutoFilter_Column_Rule::AUTOFILTER_RULETYPE_FILTER) {
+						//	Filter on absolute values
+						$columnFilterTests[$columnID] = array(
+							'method' => '_filterTestInSimpleDataSet',
+							'arguments' => array( 'filterValues' => $ruleDataSet,
+												  'blanks' => $blanks
+												)
+						);
+					} else {
+						//	Filter on date group values
+						$arguments = array();
+						foreach($ruleDataSet as $ruleValue) {
+							$date = $time = '';
+							if ((isset($ruleValue[PHPExcel_Worksheet_AutoFilter_Column_Rule::AUTOFILTER_RULETYPE_DATEGROUP_YEAR])) &&
+								($ruleValue[PHPExcel_Worksheet_AutoFilter_Column_Rule::AUTOFILTER_RULETYPE_DATEGROUP_YEAR] !== ''))
+								$date .= sprintf('%04d',$ruleValue[PHPExcel_Worksheet_AutoFilter_Column_Rule::AUTOFILTER_RULETYPE_DATEGROUP_YEAR]);
+							if ((isset($ruleValue[PHPExcel_Worksheet_AutoFilter_Column_Rule::AUTOFILTER_RULETYPE_DATEGROUP_MONTH])) &&
+								($ruleValue[PHPExcel_Worksheet_AutoFilter_Column_Rule::AUTOFILTER_RULETYPE_DATEGROUP_MONTH] != ''))
+								$date .= sprintf('%02d',$ruleValue[PHPExcel_Worksheet_AutoFilter_Column_Rule::AUTOFILTER_RULETYPE_DATEGROUP_MONTH]);
+							if ((isset($ruleValue[PHPExcel_Worksheet_AutoFilter_Column_Rule::AUTOFILTER_RULETYPE_DATEGROUP_DAY])) &&
+								($ruleValue[PHPExcel_Worksheet_AutoFilter_Column_Rule::AUTOFILTER_RULETYPE_DATEGROUP_DAY] !== ''))
+								$date .= sprintf('%02d',$ruleValue[PHPExcel_Worksheet_AutoFilter_Column_Rule::AUTOFILTER_RULETYPE_DATEGROUP_DAY]);
+							if ((isset($ruleValue[PHPExcel_Worksheet_AutoFilter_Column_Rule::AUTOFILTER_RULETYPE_DATEGROUP_HOUR])) &&
+								($ruleValue[PHPExcel_Worksheet_AutoFilter_Column_Rule::AUTOFILTER_RULETYPE_DATEGROUP_HOUR] !== ''))
+								$time .= sprintf('%02d',$ruleValue[PHPExcel_Worksheet_AutoFilter_Column_Rule::AUTOFILTER_RULETYPE_DATEGROUP_HOUR]);
+							if ((isset($ruleValue[PHPExcel_Worksheet_AutoFilter_Column_Rule::AUTOFILTER_RULETYPE_DATEGROUP_MINUTE])) &&
+								($ruleValue[PHPExcel_Worksheet_AutoFilter_Column_Rule::AUTOFILTER_RULETYPE_DATEGROUP_MINUTE] !== ''))
+								$time .= sprintf('%02d',$ruleValue[PHPExcel_Worksheet_AutoFilter_Column_Rule::AUTOFILTER_RULETYPE_DATEGROUP_MINUTE]);
+							if ((isset($ruleValue[PHPExcel_Worksheet_AutoFilter_Column_Rule::AUTOFILTER_RULETYPE_DATEGROUP_SECOND])) &&
+								($ruleValue[PHPExcel_Worksheet_AutoFilter_Column_Rule::AUTOFILTER_RULETYPE_DATEGROUP_SECOND] !== ''))
+								$time .= sprintf('%02d',$ruleValue[PHPExcel_Worksheet_AutoFilter_Column_Rule::AUTOFILTER_RULETYPE_DATEGROUP_SECOND]);
+							$dateTime = $date . $time;
+							$arguments['date'][] = $date;
+							$arguments['time'][] = $time;
+							$arguments['dateTime'][] = $dateTime;
+						}
+						//	Remove empty elements
+						$arguments['date'] = array_filter($arguments['date']);
+						$arguments['time'] = array_filter($arguments['time']);
+						$arguments['dateTime'] = array_filter($arguments['dateTime']);
+						$columnFilterTests[$columnID] = array(
+							'method' => '_filterTestInDateGroupSet',
+							'arguments' => array( 'filterValues' => $arguments,
+												  'blanks' => $blanks
+												)
+						);
+					}
+					break;
+				case PHPExcel_Worksheet_AutoFilter_Column::AUTOFILTER_FILTERTYPE_CUSTOMFILTER :
+					$ruleValues = array();
+					//	Build a list of the filter value selections
+					foreach($rules as $rule) {
+						$ruleType = $rule->getRuleType();
+						$ruleValue = $rule->getValue();
+						if (!is_numeric($ruleValue)) {
+							//	Convert to a regexp allowing for regexp reserved characters, wildcards and escaped wildcards
+var_dump($ruleValue);
+echo ' = > ';
+							$ruleValue = preg_quote($ruleValue);
+var_dump($ruleValue);
+echo ' = > ';
+							$ruleValue = str_replace(self::$_fromReplace,self::$_toReplace,$ruleValue);
+var_dump($ruleValue);
+						}
+						$ruleValues[] = array( 'operator' => $rule->getOperator(),
+											   'value' => $ruleValue
+											 );
+					}
+					$join = $filterColumn->getAndOr();
+					$columnFilterTests[$columnID] = array(
+						'method' => '_filterTypeCustomFilters',
+						'arguments' => array( 'filterRules' => $ruleValues,
+											  'join' => $join
+											)
+					);
+					break;
+				case PHPExcel_Worksheet_AutoFilter_Column::AUTOFILTER_FILTERTYPE_DYNAMICFILTER :
+					$columnFilterTests[$columnID] = array(
+						'method' => '_filterTypeDynamicFilters',
+						'arguments' => $ruleValues
+					);
+				break;
+				case PHPExcel_Worksheet_AutoFilter_Column::AUTOFILTER_FILTERTYPE_TOPTENFILTER :
+					$columnFilterTests[$columnID] = array(
+						'method' => '_filterTypeTopTenFilters',
+						'arguments' => $ruleValues
+					);
+					break;
+			}
+		}
+
+		echo 'Column Filter Test CRITERIA',PHP_EOL;
+		var_dump($columnFilterTests);
+
+		for ($row = $rangeStart[1]+1; $row <= $rangeEnd[1]; ++$row) {
+			echo 'Testing Row = ',$row,PHP_EOL;
+			$result = TRUE;
+			foreach($columnFilterTests as $columnID => $columnFilterTest) {
+				echo 'Testing cell ',$columnID.$row,PHP_EOL;
+				$cellValue = $this->_workSheet->getCell($columnID.$row)->getCalculatedValue();
+				echo 'Value is ',$cellValue,PHP_EOL;
+				//	Execute the filter test
+				$result = $result &&
+					call_user_func_array(
+						array('PHPExcel_Worksheet_AutoFilter',$columnFilterTest['method']),
+						array(
+							$cellValue,
+							$columnFilterTest['arguments']
+						)
+					);
+					echo (($result) ? 'VALID' : 'INVALID'),PHP_EOL;
+				//	If filter test has resulted in FALSE, exit straightaway rather than running any more tests
+				if (!$result)
+					break;
+			}
+			echo (($result) ? 'SHOW' : 'HIDE'),PHP_EOL;
+			$this->_workSheet->getRowDimension($row)->setVisible($result);
+		}
+
+		return $this;
+	}
+
+
 	/**
 	 * Implement PHP __clone to create a deep clone, not just a shallow copy.
 	 */
diff --git a/Classes/PHPExcel/Worksheet/AutoFilter/Column.php b/Classes/PHPExcel/Worksheet/AutoFilter/Column.php
index c4b003b2..faf823ce 100644
--- a/Classes/PHPExcel/Worksheet/AutoFilter/Column.php
+++ b/Classes/PHPExcel/Worksheet/AutoFilter/Column.php
@@ -49,7 +49,6 @@ class PHPExcel_Worksheet_AutoFilter_Column
 		//		colorFilter
 		//		extLst
 		//		iconFilter
-		//		topTen
 		self::AUTOFILTER_FILTERTYPE_FILTER,
 		self::AUTOFILTER_FILTERTYPE_CUSTOMFILTER,
 		self::AUTOFILTER_FILTERTYPE_DYNAMICFILTER,
@@ -60,7 +59,7 @@ class PHPExcel_Worksheet_AutoFilter_Column
 	const AUTOFILTER_COLUMN_ANDOR_AND	= 'and';
 	const AUTOFILTER_COLUMN_ANDOR_OR	= 'or';
 
-	private static $_ruleConnections = array(
+	private static $_ruleJoin = array(
 		self::AUTOFILTER_COLUMN_ANDOR_AND,
 		self::AUTOFILTER_COLUMN_ANDOR_OR,
 	);
@@ -208,7 +207,7 @@ class PHPExcel_Worksheet_AutoFilter_Column
 	public function setAndOr($pAndOr = self::AUTOFILTER_COLUMN_ANDOR_OR) {
 		// Lowercase And/Or
 		$pAndOr = strtolower($pAndOr);
-		if (!in_array($pAndOr,self::$_ruleConnections)) {
+		if (!in_array($pAndOr,self::$_ruleJoin)) {
 			throw new PHPExcel_Exception('Invalid rule connection for column AutoFilter.');
 		}
 
diff --git a/Classes/PHPExcel/Writer/Excel2007/Workbook.php b/Classes/PHPExcel/Writer/Excel2007/Workbook.php
index 59622fde..eefe7f10 100644
--- a/Classes/PHPExcel/Writer/Excel2007/Workbook.php
+++ b/Classes/PHPExcel/Writer/Excel2007/Workbook.php
@@ -347,14 +347,15 @@ class PHPExcel_Writer_Excel2007_Workbook extends PHPExcel_Writer_Excel2007_Write
 	private function _writeDefinedNameForAutofilter(PHPExcel_Shared_XMLWriter $objWriter = null, PHPExcel_Worksheet $pSheet = null, $pSheetId = 0)
 	{
 		// definedName for autoFilter
-		if ($pSheet->getAutoFilter()->getRange() !== '') {
+		$autoFilterRange = $pSheet->getAutoFilter()->getRange();
+		if (!empty($autoFilterRange)) {
 			$objWriter->startElement('definedName');
 			$objWriter->writeAttribute('name',			'_xlnm._FilterDatabase');
 			$objWriter->writeAttribute('localSheetId',	$pSheetId);
 			$objWriter->writeAttribute('hidden',		'1');
 
 			// Create absolute coordinate and write as raw text
-			$range = PHPExcel_Cell::splitRange($pSheet->getAutoFilter()->getRange());
+			$range = PHPExcel_Cell::splitRange($autoFilterRange);
 			$range = $range[0];
 			//	Strip any worksheet ref so we can make the cell ref absolute
 			if (strpos($range[0],'!') !== false) {
diff --git a/Classes/PHPExcel/Writer/Excel2007/Worksheet.php b/Classes/PHPExcel/Writer/Excel2007/Worksheet.php
index 80934372..770bff1b 100644
--- a/Classes/PHPExcel/Writer/Excel2007/Worksheet.php
+++ b/Classes/PHPExcel/Writer/Excel2007/Worksheet.php
@@ -148,9 +148,10 @@ class PHPExcel_Writer_Excel2007_Worksheet extends PHPExcel_Writer_Excel2007_Writ
 		// sheetPr
 		$objWriter->startElement('sheetPr');
 		//$objWriter->writeAttribute('codeName',		$pSheet->getTitle());
-
-			if ($pSheet->getAutoFilter()->getRange() !== '') {
+			$autoFilterRange = $pSheet->getAutoFilter()->getRange();
+			if (!empty($autoFilterRange)) {
 				$objWriter->writeAttribute('filterMode', 1);
+//				$pSheet->getAutoFilter()->showHideRows();
 			}
 
 			// tabColor
@@ -734,12 +735,13 @@ class PHPExcel_Writer_Excel2007_Worksheet extends PHPExcel_Writer_Excel2007_Writ
 	 */
 	private function _writeAutoFilter(PHPExcel_Shared_XMLWriter $objWriter = null, PHPExcel_Worksheet $pSheet = null)
 	{
-		if ($pSheet->getAutoFilter()->getRange() !== '') {
+		$autoFilterRange = $pSheet->getAutoFilter()->getRange();
+		if (!empty($autoFilterRange)) {
 			// autoFilter
 			$objWriter->startElement('autoFilter');
 
 			// Strip any worksheet reference from the filter coordinates
-			$range = PHPExcel_Cell::splitRange($pSheet->getAutoFilter()->getRange());
+			$range = PHPExcel_Cell::splitRange($autoFilterRange);
 			$range = $range[0];
 			//	Strip any worksheet ref
 			if (strpos($range[0],'!') !== false) {
diff --git a/Classes/PHPExcel/Writer/Excel5.php b/Classes/PHPExcel/Writer/Excel5.php
index 6eb69943..c2f78cc6 100644
--- a/Classes/PHPExcel/Writer/Excel5.php
+++ b/Classes/PHPExcel/Writer/Excel5.php
@@ -274,6 +274,8 @@ class PHPExcel_Writer_Excel5 implements PHPExcel_Writer_IWriter
 	{
 		// 1-based index to BstoreContainer
 		$blipIndex = 0;
+		$lastReducedSpId = 0;
+		$lastSpId = 0;
 
 		foreach ($this->_phpExcel->getAllsheets() as $sheet) {
 			// sheet index
@@ -282,7 +284,8 @@ class PHPExcel_Writer_Excel5 implements PHPExcel_Writer_IWriter
 			$escher = null;
 
 			// check if there are any shapes for this sheet
-			if (count($sheet->getDrawingCollection()) == 0 && $sheet->getAutoFilter()->getRange() === '') {
+			$filterRange = $sheet->getAutoFilter()->getRange();
+			if (count($sheet->getDrawingCollection()) == 0 && empty($filterRange)) {
 				continue;
 			}
 
@@ -360,8 +363,8 @@ class PHPExcel_Writer_Excel5 implements PHPExcel_Writer_IWriter
 			}
 
 			// AutoFilters
-			if($sheet->getAutoFilter()->getRange() !== ''){
-				$rangeBounds = PHPExcel_Cell::rangeBoundaries($sheet->getAutoFilter()->getRange());
+			if(!empty($filterRange)){
+				$rangeBounds = PHPExcel_Cell::rangeBoundaries($filterRange);
 				$iNumColStart = $rangeBounds[0][0];
 				$iNumColEnd = $rangeBounds[1][0];
 
diff --git a/Classes/PHPExcel/Writer/Excel5/Workbook.php b/Classes/PHPExcel/Writer/Excel5/Workbook.php
index 4fdcada2..fb0a67c4 100644
--- a/Classes/PHPExcel/Writer/Excel5/Workbook.php
+++ b/Classes/PHPExcel/Writer/Excel5/Workbook.php
@@ -783,8 +783,9 @@ class PHPExcel_Writer_Excel5_Workbook extends PHPExcel_Writer_Excel5_BIFFwriter
 		// write autofilters, if any
 		for ($i = 0; $i < $total_worksheets; ++$i) {
 			$sheetAutoFilter = $this->_phpExcel->getSheet($i)->getAutoFilter();
-			if($sheetAutoFilter->getRange() !== ''){
-				$rangeBounds = PHPExcel_Cell::rangeBoundaries($sheetAutoFilter->getRange());
+			$autoFilterRange = $sheetAutoFilter->getRange();
+			if(!empty($autoFilterRange)) {
+				$rangeBounds = PHPExcel_Cell::rangeBoundaries($autoFilterRange);
 
 				//Autofilter built in name
 				$name = pack('C', 0x0D);
diff --git a/Classes/PHPExcel/Writer/Excel5/Worksheet.php b/Classes/PHPExcel/Writer/Excel5/Worksheet.php
index b079da58..d6d6c214 100644
--- a/Classes/PHPExcel/Writer/Excel5/Worksheet.php
+++ b/Classes/PHPExcel/Writer/Excel5/Worksheet.php
@@ -390,8 +390,8 @@ class PHPExcel_Writer_Excel5_Worksheet extends PHPExcel_Writer_Excel5_BIFFwriter
 				$this->_writeColinfo($this->_colinfo[$i]);
 			}
 		}
-
-		if ($_phpSheet->getAutoFilter()->getRange() !== '') {
+		$autoFilterRange = $_phpSheet->getAutoFilter()->getRange();
+		if (!empty($autoFilterRange)) {
 			// Write AUTOFILTERINFO
 			$this->_writeAutoFilterInfo();
 		}
diff --git a/Classes/PHPExcel/Writer/HTML.php b/Classes/PHPExcel/Writer/HTML.php
index 5ce2b8c4..68c25f98 100644
--- a/Classes/PHPExcel/Writer/HTML.php
+++ b/Classes/PHPExcel/Writer/HTML.php
@@ -782,7 +782,8 @@ class PHPExcel_Writer_HTML implements PHPExcel_Writer_IWriter {
 		$css['vertical-align'] = $this->_mapVAlign($pStyle->getVertical());
 		if ($textAlign = $this->_mapHAlign($pStyle->getHorizontal())) {
 			$css['text-align'] = $textAlign;
-			if(in_array($textAlign,array('left','right'))) $css['padding-'.$textAlign] = (string)((int)$pStyle->getIndent() * 9).'px';
+			if(in_array($textAlign,array('left','right')))
+				$css['padding-'.$textAlign] = (string)((int)$pStyle->getIndent() * 9).'px';
 		}
 
 		// Return
diff --git a/Documentation/PHPExcel developer documentation.doc b/Documentation/PHPExcel developer documentation.doc
index c89a6aa2..31ff50a7 100644
Binary files a/Documentation/PHPExcel developer documentation.doc and b/Documentation/PHPExcel developer documentation.doc differ