diff --git a/mainwindow.cpp b/mainwindow.cpp
index 09750c9..e2390ee 100644
--- a/mainwindow.cpp
+++ b/mainwindow.cpp
@@ -64,7 +64,7 @@ MainWindow::MainWindow(QWidget *parent) : QMainWindow(parent)
     }
     _openFilter.append("*.fit *.fits *.fts *.fz *.xisf *.cr2 *.cr3 *.nef *.dng)");
     _openFilter.append(tr(";;All files (*)"));
-    nameFilter.append({"fit", "fits", "xisf", "cr2", "cr3", "nef", "dng"});
+    nameFilter.append({"fit", "fits", "fts", "fz", "xisf", "cr2", "cr3", "nef", "dng"});
     QImageReader::setAllocationLimit(0);
 
     m_info = new ImageInfo(this);