diff --git a/NEWS.md b/NEWS.md
index e92ed694..f27be844 100644
--- a/NEWS.md
+++ b/NEWS.md
@@ -1,5 +1,6 @@
 Version 0.7.0
  - fix: Backspace still works in readonly mode
+ - fix: save as file dialog's operation mode is not correct
 
 Version 0.6.8
  - enhancement: add link to cppreference in the help menu
diff --git a/RedPandaIDE/editor.cpp b/RedPandaIDE/editor.cpp
index cdc7001f..d99ba82e 100644
--- a/RedPandaIDE/editor.cpp
+++ b/RedPandaIDE/editor.cpp
@@ -245,16 +245,21 @@ bool Editor::saveAs(const QString &name, bool fromProject){
     QString newName = name;
     if (name.isEmpty()) {
         QString selectedFileFilter;
-        if (pSettings->editor().defaultFileCpp())
+        QString defaultExt;
+        if (pSettings->editor().defaultFileCpp()) {
             selectedFileFilter = pSystemConsts->defaultCPPFileFilter();
-        else
+            defaultExt = "cpp";
+        } else {
             selectedFileFilter = pSystemConsts->defaultCFileFilter();
+            defaultExt = "c";
+        }
         QFileDialog dialog(this,tr("Save As"),extractFilePath(mFilename),
                            pSystemConsts->defaultFileFilters().join(";;"));
         dialog.selectNameFilter(selectedFileFilter);
+        dialog.setDefaultSuffix(defaultExt);
         dialog.selectFile(mFilename);
         dialog.setFileMode(QFileDialog::AnyFile);
-        dialog.setOption(QFileDialog::DontConfirmOverwrite,false);
+        dialog.setAcceptMode(QFileDialog::AcceptSave);
         connect(&dialog, &QFileDialog::filterSelected,
                 [&dialog](const QString &filter){
             int pos = filter.indexOf("*.");
diff --git a/RedPandaIDE/mainwindow.cpp b/RedPandaIDE/mainwindow.cpp
index c8ef1260..3d09fa8e 100644
--- a/RedPandaIDE/mainwindow.cpp
+++ b/RedPandaIDE/mainwindow.cpp
@@ -3910,7 +3910,7 @@ void MainWindow::on_actionAdd_to_project_triggered()
                        mProject->directory(),
                        pSystemConsts->defaultFileFilters().join(";;"));
     dialog.setFileMode(QFileDialog::ExistingFiles);
-    dialog.setOption(QFileDialog::DontConfirmOverwrite,true);
+    dialog.setAcceptMode(QFileDialog::AcceptOpen);
     if (dialog.exec()) {
         QModelIndex current = ui->projectView->currentIndex();
         FolderNode * node = nullptr;
diff --git a/RedPandaIDE/qsynedit/SynEdit.cpp b/RedPandaIDE/qsynedit/SynEdit.cpp
index 3deeb68e..9a772402 100644
--- a/RedPandaIDE/qsynedit/SynEdit.cpp
+++ b/RedPandaIDE/qsynedit/SynEdit.cpp
@@ -2202,7 +2202,7 @@ void SynEdit::computeScroll(int X, int Y)
         mScrollDeltaY = (Y - iScrollBounds.top()) / mTextHeight - 1;
     else if (Y >= iScrollBounds.bottom())
         mScrollDeltaY = (Y - iScrollBounds.bottom()) / mTextHeight + 1;
-      else
+    else
         mScrollDeltaY = 0;
 
     if (mScrollDeltaX!=0 || mScrollDeltaY!=0)