diff --git a/filemanager/inc/class.uifilemanager.inc.php b/filemanager/inc/class.uifilemanager.inc.php
index 6d0d763f8c..9f40e3ef48 100755
--- a/filemanager/inc/class.uifilemanager.inc.php
+++ b/filemanager/inc/class.uifilemanager.inc.php
@@ -1719,6 +1719,16 @@
 				}
 				$viewable = array('','text/plain','text/csv','text/html','text/text');
 
+				//hack for powerpoint (NDEE 070804)
+				//manage some special mimetypes here
+				$extension = strstr($this->file,'.');
+				if($extension="ppt")
+				{
+					$mime_type="x-application/powerpoint";
+				}
+				// END
+
+
 				if(in_array($mime_type,$viewable) && !$_GET['download'])
 				{