--- Sigil-git-05d34a3d1/src/Misc/Utility.cpp~
+++ Sigil-git-05d34a3d1/src/Misc/Utility.cpp
@@ -500,6 +500,10 @@
 
     // Check if we can open the file
     if (!file.open(QFile::ReadOnly)) {
+        if (!strcmp ("--no-sandbox",
+            fullfilepath.toStdString().c_str()))
+                { return false; }
+
         Utility::DisplayStdErrorDialog(
             QObject::tr("Cannot read file %1:\n%2.")
             .arg(fullfilepath)