diff --git a/Classes/PHPExcel/IOFactory.php b/Classes/PHPExcel/IOFactory.php
index 30762c1b..cd7bbf91 100644
--- a/Classes/PHPExcel/IOFactory.php
+++ b/Classes/PHPExcel/IOFactory.php
@@ -223,6 +223,7 @@ class PHPExcel_IOFactory
 		// First, lucky guess by inspecting file extension
 		$pathinfo = pathinfo($pFilename);
 
+		$extensionType = NULL;
 		if (isset($pathinfo['extension'])) {
 			switch (strtolower($pathinfo['extension'])) {
 				case 'xlsx':			//	Excel (OfficeOpenXML) Spreadsheet
@@ -261,19 +262,20 @@ class PHPExcel_IOFactory
 					break;
 			}
 
-			$reader = self::createReader($extensionType);
-			// Let's see if we are lucky
-			if (isset($reader) && $reader->canRead($pFilename)) {
-				return $reader;
+			if ($extensionType !== NULL) {
+				$reader = self::createReader($extensionType);
+				// Let's see if we are lucky
+				if (isset($reader) && $reader->canRead($pFilename)) {
+					return $reader;
+				}
 			}
-
 		}
 
 		// If we reach here then "lucky guess" didn't give any result
 		// Try walking through all the options in self::$_autoResolveClasses
 		foreach (self::$_autoResolveClasses as $autoResolveClass) {
 			//	Ignore our original guess, we know that won't work
-		    if ($reader !== $extensionType) {
+			if ($autoResolveClass !== $extensionType) {
 				$reader = self::createReader($autoResolveClass);
 				if ($reader->canRead($pFilename)) {
 					return $reader;
@@ -281,6 +283,6 @@ class PHPExcel_IOFactory
 			}
 		}
 
-    	throw new Exception('Unable to identify a reader for this file');
+		throw new Exception('Unable to identify a reader for this file');
 	}	//	function createReaderForFile()
 }
diff --git a/changelog.txt b/changelog.txt
index 845d93fc..514a52db 100644
--- a/changelog.txt
+++ b/changelog.txt
@@ -105,6 +105,7 @@ Fixed in develop branch:
 - Bugfix:   (MBaker)     Work item 18146 - Chart Refresh returning cell reference rather than values
 - Bugfix:   (MBaker)     Work item 18145 - Autoshape being identified in twoCellAnchor when includeCharts is TRUE triggering load error
 - Bugfix:   (MBaker)     Work item 18325 - v-type texts for series labels now recognised and parsed correctly
+- Bugfix:   (wolf5x)     Work item 18492 - load file failed if the file has no extensionType
 
 
 2012-05-19 (v1.7.7):