diff --git a/newfol b/newfol
index 7dcc4fb..7fa43dc 100755
--- a/newfol
+++ b/newfol
@@ -13,6 +13,7 @@ import locale
 import os
 import os.path
 import re
+import shutil
 import subprocess
 import tempfile
 import urwid
@@ -899,6 +900,17 @@ class MenuView(ListView):
             self.OPTIONS.keys()])
         return self._render_listview("Main Menu", self.OPTIONS.keys(), content)
 
+def display_read_only(name):
+    """Display this file read-only.
+
+    Try very hard to ensure the user does not modify it.
+    """
+    tempdir = tempfile.TemporaryDirectory()
+    temp = os.path.join(tempdir.name, "view")
+    shutil.copyfile(name, temp)
+    os.chmod(temp, 0o400)
+    subprocess.call(["sensible-editor", temp])
+
 def display_cheat_sheet(name, loop):
     if name is None:
         mbox = MessageBox("No cheat sheet was registered in the schema file.")
@@ -908,8 +920,7 @@ def display_cheat_sheet(name, loop):
         mbox = MessageBox("The cheat sheet file doesn't exist.")
         mbox.render(loop)
         return
-    os.chmod(name, 0o400)
-    subprocess.call(["sensible-editor", name])
+    display_read_only(name)
 
 def render_previous_view(loop):
     if len(DatabaseData().views) > 1: