diff --git a/dbd/qq/SYS_SAIMOD_CRON.php b/dbd/qq/SYS_SAIMOD_CRON.php
new file mode 100644
index 0000000..76943e1
--- /dev/null
+++ b/dbd/qq/SYS_SAIMOD_CRON.php
@@ -0,0 +1,11 @@
+<?php
+namespace SYSTEM\DBD;
+
+class SYS_SAIMOD_CRON extends \SYSTEM\DB\QQ {
+    protected static function query(){
+        return new \SYSTEM\DB\QQuery(get_class(),
+//pg            
+'',
+//mys
+'SELECT * FROM system_cron ORDER BY class;'
+);}}
diff --git a/dbd/sql/mysql/data/system_api.sql b/dbd/sql/mysql/data/system_api.sql
index 9a6e312..2ac0b3c 100644
--- a/dbd/sql/mysql/data/system_api.sql
+++ b/dbd/sql/mysql/data/system_api.sql
@@ -1,16 +1,16 @@
-INSERT INTO `system_api` (`ID`, `group`, `type`, `parentID`, `parentValue`, `name`, `verify`) VALUES (10, 42, 0, -1, NULL, 'call', NULL);
-INSERT INTO `system_api` (`ID`, `group`, `type`, `parentID`, `parentValue`, `name`, `verify`) VALUES (11, 42, 0, 10, NULL, 'action', NULL);
+INSERT INTO `system_api` (`ID`, `group`, `type`, `parentID`, `parentValue`, `name`, `verify`) VALUES (10, 0, 0, -1, NULL, 'call', NULL);
+INSERT INTO `system_api` (`ID`, `group`, `type`, `parentID`, `parentValue`, `name`, `verify`) VALUES (11, 0, 0, 10, NULL, 'action', NULL);
 
-INSERT INTO `system_api` (`ID`, `group`, `type`, `parentID`, `parentValue`, `name`, `verify`) VALUES (20, 42, 2, 11, 'login', 'username', 'STRING');
-INSERT INTO `system_api` (`ID`, `group`, `type`, `parentID`, `parentValue`, `name`, `verify`) VALUES (21, 42, 2, 11, 'login', 'password_sha', 'STRING');
-INSERT INTO `system_api` (`ID`, `group`, `type`, `parentID`, `parentValue`, `name`, `verify`) VALUES (22, 42, 2, 11, 'login', 'password_md5', 'STRING');
+INSERT INTO `system_api` (`ID`, `group`, `type`, `parentID`, `parentValue`, `name`, `verify`) VALUES (20, 0, 2, 11, 'login', 'username', 'STRING');
+INSERT INTO `system_api` (`ID`, `group`, `type`, `parentID`, `parentValue`, `name`, `verify`) VALUES (21, 0, 2, 11, 'login', 'password_sha', 'STRING');
+INSERT INTO `system_api` (`ID`, `group`, `type`, `parentID`, `parentValue`, `name`, `verify`) VALUES (22, 0, 2, 11, 'login', 'password_md5', 'STRING');
 
-INSERT INTO `system_api` (`ID`, `group`, `type`, `parentID`, `parentValue`, `name`, `verify`) VALUES (23, 42, 2, 11, 'check', 'rightid', 'UINT');
+INSERT INTO `system_api` (`ID`, `group`, `type`, `parentID`, `parentValue`, `name`, `verify`) VALUES (23, 0, 2, 11, 'check', 'rightid', 'UINT');
 
-INSERT INTO `system_api` (`ID`, `group`, `type`, `parentID`, `parentValue`, `name`, `verify`) VALUES (24, 42, 2, 11, 'create', 'username', 'STRING');
-INSERT INTO `system_api` (`ID`, `group`, `type`, `parentID`, `parentValue`, `name`, `verify`) VALUES (25, 42, 2, 11, 'create', 'password_sha', 'STRING');
-INSERT INTO `system_api` (`ID`, `group`, `type`, `parentID`, `parentValue`, `name`, `verify`) VALUES (26, 42, 2, 11, 'create', 'email', 'STRING');
-INSERT INTO `system_api` (`ID`, `group`, `type`, `parentID`, `parentValue`, `name`, `verify`) VALUES (27, 42, 2, 11, 'create', 'locale', 'LANG');
+INSERT INTO `system_api` (`ID`, `group`, `type`, `parentID`, `parentValue`, `name`, `verify`) VALUES (24, 0, 2, 11, 'create', 'username', 'STRING');
+INSERT INTO `system_api` (`ID`, `group`, `type`, `parentID`, `parentValue`, `name`, `verify`) VALUES (25, 0, 2, 11, 'create', 'password_sha', 'STRING');
+INSERT INTO `system_api` (`ID`, `group`, `type`, `parentID`, `parentValue`, `name`, `verify`) VALUES (26, 0, 2, 11, 'create', 'email', 'STRING');
+INSERT INTO `system_api` (`ID`, `group`, `type`, `parentID`, `parentValue`, `name`, `verify`) VALUES (27, 0, 2, 11, 'create', 'locale', 'LANG');
 
-INSERT INTO `system_api` (`ID`, `group`, `type`, `parentID`, `parentValue`, `name`, `verify`) VALUES (30, 42, 2, 10, 'files', 'cat', 'STRING');
-INSERT INTO `system_api` (`ID`, `group`, `type`, `parentID`, `parentValue`, `name`, `verify`) VALUES (31, 42, 3, 30, 'files', 'id', 'STRING');
\ No newline at end of file
+INSERT INTO `system_api` (`ID`, `group`, `type`, `parentID`, `parentValue`, `name`, `verify`) VALUES (30, 0, 2, 10, 'files', 'cat', 'STRING');
+INSERT INTO `system_api` (`ID`, `group`, `type`, `parentID`, `parentValue`, `name`, `verify`) VALUES (31, 0, 3, 10, 'files', 'id', 'STRING');
\ No newline at end of file
diff --git a/files/files.php b/files/files.php
index 4475c54..2e74fa8 100644
--- a/files/files.php
+++ b/files/files.php
@@ -21,8 +21,16 @@ class files {
         if (!in_array($id, $folder)) {
             throw new \SYSTEM\LOG\ERROR("No matching ID '" . $id . "' found.");}
 
-        \SYSTEM\HEADER::PNG();
-        return file_get_contents(self::$folders[$cat].$id);
+        $ext = pathinfo(self::$folders[$cat].$id);
+        $ext = strtoupper(array_key_exists('extension', $ext) ? $ext['extension'] : '');
+        if(\SYSTEM\HEADER::available($ext)){
+            call_user_func('\SYSTEM\HEADER::'.$ext);
+        }else{
+            \SYSTEM\HEADER::FILE($id);}
+            
+        if(!self::file_get_contents_chunked(self::$folders[$cat].$id,4096,function($chunk,&$handle,$iteration){echo $chunk;})){
+            throw new \SYSTEM\LOG\ERROR("Could not transfere File.");}
+        return;
     }
 
     public static function put($cat, $id, $contents) {
@@ -57,4 +65,17 @@ class files {
 
     public static function getURL($cat, $id = null) {
         return \SYSTEM\CONFIG\config::get(\SYSTEM\CONFIG\config_ids::SYS_CONFIG_PATH_BASEURL) . 'api.php?call=files&cat=' . $cat . '&id=' . $id;}
+   
+    private static function file_get_contents_chunked($file,$chunk_size,$callback)
+    {
+        $handle = fopen($file, "r");
+        $i = 0;
+        while (!feof($handle))
+        {
+            call_user_func_array($callback,array(fread($handle,$chunk_size),&$handle,$i));
+            $i++;
+        }
+        fclose($handle);
+        return true;
+    }
 }
\ No newline at end of file
diff --git a/sai/modules/saimod_sys_cron/saimod_sys_cron.php b/sai/modules/saimod_sys_cron/saimod_sys_cron.php
index 54a2a37..698b6ea 100644
--- a/sai/modules/saimod_sys_cron/saimod_sys_cron.php
+++ b/sai/modules/saimod_sys_cron/saimod_sys_cron.php
@@ -3,51 +3,16 @@ namespace SYSTEM\SAI;
 
 class saimod_sys_cron extends \SYSTEM\SAI\SaiModule {    
     public static function sai_mod__SYSTEM_SAI_saimod_sys_cron(){
-        //$last_group = -1;
         $vars = array();
+        $vars['tabopts'] = \SYSTEM\PAGE\replace::replaceFile(\SYSTEM\SERVERPATH(new \SYSTEM\PSAI(),'modules/saimod_sys_cron/tabopt.tpl'), array());
+        $vars['content'] = '';
         
-        $con = new \SYSTEM\DB\Connection(\SYSTEM\system::getSystemDBInfo());
-        if(\SYSTEM\system::isSystemDbInfoPG()){
-            $res = $con->query('SELECT "group", count(*) as "count" FROM system.api GROUP BY "group" ORDER BY "group" ASC;');
-        } else {
-            $res = $con->query('SELECT `group`, count(*) as `count` FROM system_api GROUP BY `group` ORDER BY `group` ASC;');
-        }
-        
-        $vars['tabopts'] = '';
-        $first = true;
+        $res = \SYSTEM\DBD\SYS_SAIMOD_CRON::QQ();        
         while($r = $res->next()){
-            $vars2 = array( 'active' => ($first ? 'active' : ''),
-                            'tab_id' => $r['group']);
-            $first = false;
-            $vars['tabopts'] .= \SYSTEM\PAGE\replace::replaceFile(\SYSTEM\SERVERPATH(new \SYSTEM\PSAI(),'modules/saimod_sys_cron/tabopt.tpl'), $vars2);
-        }      
-        
-        if(\SYSTEM\system::isSystemDbInfoPG()){
-            $res = $con->query('SELECT * FROM system.api ORDER BY "group", "ID" ASC;');
-        } else {
-            $res = $con->query('SELECT * FROM system_api ORDER BY `group`, `ID` ASC;');
-        }
-        
-        while($r = $res->next()){            
-            $tabs[$r['group']]['tab_id'] = $r['group'];            
-            $tabs[$r['group']]['content'] = isset($tabs[$r['group']]['content']) ? $tabs[$r['group']]['content'] : '';
-            $r['tr_class'] = self::tablerow_class($r['type']);
-            $r['type'] = self::type_names($r['type']);
-            $tabs[$r['group']]['content'] .= \SYSTEM\PAGE\replace::replaceFile(\SYSTEM\SERVERPATH(new \SYSTEM\PSAI(),'modules/saimod_sys_cron/list_entry.tpl'), $r);                        
-        }   
-        
-        $vars['tabs'] = '';
-        $first = true;                   
-        foreach($tabs as $tab){
-            $tab['active'] = ($first ? 'active' : '');
-            $first = false;
-            $vars['tabs'] .= \SYSTEM\PAGE\replace::replaceFile(\SYSTEM\SERVERPATH(new \SYSTEM\PSAI(),'modules/saimod_sys_cron/tab.tpl'), $tab);}
-               
+            $vars['content'] .= \SYSTEM\PAGE\replace::replaceFile(\SYSTEM\SERVERPATH(new \SYSTEM\PSAI(),'modules/saimod_sys_cron/list_entry.tpl'), $r);}   
+
+        $vars['tabs'] = \SYSTEM\PAGE\replace::replaceFile(\SYSTEM\SERVERPATH(new \SYSTEM\PSAI(),'modules/saimod_sys_cron/tab.tpl'), $vars);
         return \SYSTEM\PAGE\replace::replaceFile(\SYSTEM\SERVERPATH(new \SYSTEM\PSAI(),'modules/saimod_sys_cron/tabs.tpl'), $vars);
-       
-/*        $result = "";
-        $result .= '<tr class="'.self::tablerow_class($r['type']).'">'.'<td>'.$r['ID'].'</td>'.'<td>'.$r['group'].'</td>'.'<td>'.$r['type'].'</td>'.'<td>'.$r['parentID'].'</td>'.'<td>'.$r['parentValue'].'</td>'.'<td>'.$r['name'].'</td>'.'<td>'.$r['verify'].'</td>'.'</tr>';                                          
-        return $result;*/
     }
     
     public static function sai_mod__system_sai_saimod_sys_api_action_deletedialog($ID){
@@ -69,17 +34,6 @@ class saimod_sys_cron extends \SYSTEM\SAI\SaiModule {
         return \SYSTEM\LOG\JsonResult::ok();
     }
     
-    private static function type_names($type){
-        switch($type){
-            case 0: return 'COMMAND';
-            case 1: return 'COMMAND_FLAG';
-            case 2: return 'PARAMETER';
-            case 3: return 'PARAMETER_OPT';
-            case 4: return 'STATIC';
-            default: return 'Problem unknown type';
-        }   
-    }
-    
     private static function tablerow_class($flag){
         switch($flag){
             case 0: return 'info';
diff --git a/sai/modules/saimod_sys_cron/tab.tpl b/sai/modules/saimod_sys_cron/tab.tpl
index bbfaecf..3de066f 100644
--- a/sai/modules/saimod_sys_cron/tab.tpl
+++ b/sai/modules/saimod_sys_cron/tab.tpl
@@ -1,4 +1,4 @@
-<div class="tab-pane ${active}" id="tab_${tab_id}">
+<div class="tab-pane active" id="tab_cron">
     <table class="table table-hover table-condensed" style="overflow: auto;">
         <tr>
             <th>class</th>
diff --git a/sai/modules/saimod_sys_cron/tabopt.tpl b/sai/modules/saimod_sys_cron/tabopt.tpl
index cf223b0..bb18245 100644
--- a/sai/modules/saimod_sys_cron/tabopt.tpl
+++ b/sai/modules/saimod_sys_cron/tabopt.tpl
@@ -1 +1 @@
-<li class="${active}"><a href="#tab_${tab_id}">Group ${tab_id}</a></li>
\ No newline at end of file
+<li class="active"><a href="#tab_cron">Cron</a></li>
\ No newline at end of file
diff --git a/sai/modules/saimod_sys_cron/tabs.tpl b/sai/modules/saimod_sys_cron/tabs.tpl
index c1596be..b8877bb 100644
--- a/sai/modules/saimod_sys_cron/tabs.tpl
+++ b/sai/modules/saimod_sys_cron/tabs.tpl
@@ -3,7 +3,7 @@
 <hr>
 <div id="cron_content">    
 <div class="tabbable">
-    <ul class="nav nav-tabs" id="localetab">
+    <ul class="nav nav-tabs" id="crontab">
         ${tabopts}
     </ul>
     <div class="tab-content">
diff --git a/system/HEADER.php b/system/HEADER.php
index 3dd8ae1..b21c85f 100644
--- a/system/HEADER.php
+++ b/system/HEADER.php
@@ -2,7 +2,6 @@
 namespace SYSTEM;
 
 class HEADER {
-    
     private static function checkHeader(){
         $file = null;
         $line = null;
@@ -15,10 +14,25 @@ class HEADER {
     public static function JSON(){
         if(self::checkHeader()){
             header('Access-Control-Allow-Origin: *');//allow cross domain calls
-            header('content-type: application/json');}
-    }
+            header('content-type: application/json');}}
     public static function PNG(){
         if(self::checkHeader()){
-            header('content-type:image/png;');}
-    }
+            header('content-type:image/png;');}}
+    public static function JPG(){
+        if(self::checkHeader()){
+            header('content-type:image/jpeg;');}}
+    public static function JPEG(){
+        if(self::checkHeader()){
+            header('content-type:image/jpeg;');}}
+    public static function GIF(){
+        if(self::checkHeader()){
+            header('content-type:image/gif;');}}
+            
+    public static function FILE($filename){
+        header("Content-type: application/octet-stream");
+        header("Content-Disposition: attachment; filename=\"".$filename."\"");}
+    
+    public static function available($datatype){
+        $datatype = strtoupper($datatype);
+        return \method_exists('\SYSTEM\HEADER', $datatype);}
 }
\ No newline at end of file