diff --git a/src/widgets/atcoreinstancewidget.cpp b/src/widgets/atcoreinstancewidget.cpp
--- a/src/widgets/atcoreinstancewidget.cpp
+++ b/src/widgets/atcoreinstancewidget.cpp
@@ -324,7 +324,7 @@
             , i18n("No filename sent from calling method, please check and try again.")
         );
         return;
-    } else if (!QFileInfo(fileName.toString()).isReadable()) {
+    } else if (!QFileInfo(fileName.toLocalFile()).isReadable()) {
         QMessageBox::critical(
             this
             , i18n("File not found")