diff --git a/system/codeigniter/Common.php b/system/codeigniter/Common.php
index b6f0a46..d9ddf80 100644
--- a/system/codeigniter/Common.php
+++ b/system/codeigniter/Common.php
@@ -30,6 +30,44 @@
 // ------------------------------------------------------------------------
 
 /**
+ * Tests for file writability
+ *
+ * is_writable() returns TRUE on Windows servers
+ * when you really can't write to the file
+ * as the OS reports to PHP as FALSE only if the
+ * read-only attribute is marked.  Ugh?
+ *
+ * @access	private
+ * @return	void
+ */	
+function is_really_writable($file)
+{
+	if (is_dir($file))
+	{
+		$file = rtrim($file, '/').'/'.md5(rand(1,100));
+		
+		if (($fp = @fopen($file, 'ab')) === FALSE)
+		{
+			return FALSE;
+		}
+		
+		fclose($fp);
+		@chmod($file, 0777);
+		@unlink($file);
+		return TRUE;
+	}
+	elseif (($fp = @fopen($file, 'ab')) === FALSE)
+	{
+		return FALSE;
+	}
+
+	fclose($fp);
+	return TRUE;
+}
+
+// ------------------------------------------------------------------------
+
+/**
 * Class registry
 *
 * This function acts as a singleton.  If the requested class does not