diff --git a/jam b/jam
index 86eaeb5..63103f9 100755
--- a/jam
+++ b/jam
@@ -5,10 +5,12 @@ from kivy.uix.widget import Widget
 from kivy.uix.boxlayout import BoxLayout
 from kivy.config import Config
 import sys
+import os.path
 
 from cross import Cross,Cross_painter
 from status_bar import Status_bar
 from command_prompt import Command_prompt
+import filecheck
 
 # App class
 class Jam_app(App):
@@ -39,6 +41,13 @@ class Jam_app(App):
         layout.add_widget(self.status_bar)
         layout.add_widget(self.command_prompt)
 
+        # read openfile
+        if os.path.isfile(self.openfile):
+            # read the file
+            self.painter.read(self.openfile)
+            # set readonly mode
+            self.readonly=not os.access(self.openfile,os.W_OK)
+
         return layout
 
 
@@ -51,6 +60,11 @@ Config.set('kivy', 'exit_on_escape', 0)
 openfile=""
 if len(sys.argv)==2:
     openfile=sys.argv[1]
+    # check file
+    (ret,message)=filecheck.check_edit(openfile)
+    if ret<0:
+        print(message,file=sys.stderr)
+        exit(-1)
 
 # run
 if __name__ == '__main__':