diff --git a/htdocs/projet/class/project.class.php b/htdocs/projet/class/project.class.php
index b9c81f699ea..6b1fa648f24 100644
--- a/htdocs/projet/class/project.class.php
+++ b/htdocs/projet/class/project.class.php
@@ -439,21 +439,9 @@ class Project extends CommonObject
             if ($conf->projet->dir_output)
             {
                 $dir = $conf->projet->dir_output . "/" . $projectref;
-                $file = $conf->projet->dir_output . "/" . $projectref . "/" . $projectref . ".pdf";
-                if (file_exists($file))
-                {
-                    dol_delete_preview($this);
-
-                    if (!dol_delete_file($file))
-                    {
-                        $this->error = 'ErrorFailToDeleteFile';
-                        $this->db->rollback();
-                        return 0;
-                    }
-                }
                 if (file_exists($dir))
                 {
-                    $res = @dol_delete_dir($dir);
+                    $res = @dol_delete_dir_recursive($dir);
                     if (!$res)
                     {
                         $this->error = 'ErrorFailToDeleteDir';
diff --git a/htdocs/projet/class/task.class.php b/htdocs/projet/class/task.class.php
index d1b8c41cb78..6673a7b9b64 100644
--- a/htdocs/projet/class/task.class.php
+++ b/htdocs/projet/class/task.class.php
@@ -319,6 +319,24 @@ class Task extends CommonObject
             $this->db->rollback();
             return 0;
         }
+        
+      	//Delete associated link file
+    	//retreive project ref to know project folder
+    	$sql = "SELECT p.ref";
+        $sql.= " FROM ".MAIN_DB_PREFIX."projet_task as t INNER JOIN ".MAIN_DB_PREFIX."projet as p ON p.rowid=t.fk_projet";
+        $sql.= " WHERE t.rowid = ".$this->id;
+
+   		dol_syslog(get_class($this)."::delete(retreive proj ref) sql=".$sql, LOG_DEBUG);
+    	$resql_projref=$this->db->query($sql);
+   		if ($resql_projref)
+    	{  
+        	if ($this->db->num_rows($resql_projref))
+        	{
+            	$obj = $this->db->fetch_object($resql_projref);
+            	$projectref	= $obj->ref;
+        	}
+        }
+		$this->db->free($resql_projref);
 
         if (! $error)
         {
@@ -370,6 +388,27 @@ class Task extends CommonObject
         else
         {
             $this->db->commit();
+            
+            $this->db->free($resql);
+            
+			//Delete associated link file
+	        if ($conf->projet->dir_output)
+	        {
+	            $dir = $conf->projet->dir_output . "/" . dol_sanitizeFileName($projectref) . '/' . dol_sanitizeFileName($this->id);
+	            dol_syslog(get_class($this)."::delete(retreive proj ref) dir=".$dir, LOG_DEBUG);
+	            if (file_exists($dir))
+	            {
+	            	require_once(DOL_DOCUMENT_ROOT . "/core/lib/files.lib.php");
+	                $res = @dol_delete_dir_recursive($dir);
+	                if (!$res)
+	                {
+	                    $this->error = 'ErrorFailToDeleteDir';
+	                    $this->db->rollback();
+	                    return 0;
+	                }
+	            }
+	        }
+            
             return 1;
         }
     }
@@ -395,6 +434,7 @@ class Task extends CommonObject
         {
             $obj=$this->db->fetch_object($resql);
             if ($obj) $ret=$obj->nb;
+            $this->db->free($resql);
         }
 
         if (! $error)