diff --git a/NEWS.md b/NEWS.md
index 1c2a2241..0da98cef 100644
--- a/NEWS.md
+++ b/NEWS.md
@@ -5,6 +5,8 @@ Red Panda C++ Version 2.19
   - fix: Crash when a project is removed from the disk while it is openned in RedPanda-C++.
   - fix: The option "Open CPU info dialog when signal received" can't be correctly set in the options dialog's debugger page.
   - fix: Crash when drag the selection beyond the end of the document.
+  - enhancement: Drag the selection beyond the end of the document, and move/copy it beyond the last line.
+  - enhancement: Open Containing folder will auto select the file in windows file explore.
 
 Red Panda C++ Version 2.18
 
diff --git a/RedPandaIDE/editor.cpp b/RedPandaIDE/editor.cpp
index 0a8ee216..8b91c7ea 100644
--- a/RedPandaIDE/editor.cpp
+++ b/RedPandaIDE/editor.cpp
@@ -2708,6 +2708,7 @@ bool Editor::handleBraceCompletion()
         setSelText(text);
         processCommand(QSynedit::EditCommand::InsertLine);
     }
+
     processCommand(QSynedit::EditCommand::Char,'}');
     if (
         ( (s.startsWith("struct")
diff --git a/RedPandaIDE/mainwindow.cpp b/RedPandaIDE/mainwindow.cpp
index 2aa65a29..39c36cf6 100644
--- a/RedPandaIDE/mainwindow.cpp
+++ b/RedPandaIDE/mainwindow.cpp
@@ -4546,16 +4546,7 @@ void MainWindow::onFilesViewOpenInExplorer()
 {
     QString path = mFileSystemModel.filePath(ui->treeFiles->currentIndex());
     if (!path.isEmpty()) {
-        QFileInfo info(path);
-        if (info.isFile()){
-            QDesktopServices::openUrl(
-                        QUrl("file:///"+
-                             includeTrailingPathDelimiter(info.path()),QUrl::TolerantMode));
-        } else if (info.isDir()){
-            QDesktopServices::openUrl(
-                        QUrl("file:///"+
-                             includeTrailingPathDelimiter(path),QUrl::TolerantMode));
-        }
+        openFileFolderInExplorer(path);
     }
 }
 
@@ -6718,12 +6709,13 @@ void MainWindow::on_actionOpen_Containing_Folder_triggered()
 {
     Editor* editor = mEditorList->getEditor();
     if (editor) {
-        QFileInfo info(editor->filename());
-        if (!info.path().isEmpty()) {
-            QDesktopServices::openUrl(
-                        QUrl("file:///"+
-                             includeTrailingPathDelimiter(info.path()),QUrl::TolerantMode));
-        }
+        openFileFolderInExplorer(editor->filename());
+//        QFileInfo info(editor->filename());
+//        if (!info.path().isEmpty()) {
+//            QDesktopServices::openUrl(
+//                        QUrl("file:///"+
+//                             includeTrailingPathDelimiter(info.path()),QUrl::TolerantMode));
+//        }
     }
 }
 
diff --git a/RedPandaIDE/utils.cpp b/RedPandaIDE/utils.cpp
index 55e5a3b6..fcb28539 100644
--- a/RedPandaIDE/utils.cpp
+++ b/RedPandaIDE/utils.cpp
@@ -12,6 +12,7 @@
 #include "compiler/executablerunner.h"
 #include <QComboBox>
 #ifdef Q_OS_WIN
+#include <QDesktopServices>
 #include <windows.h>
 #endif
 
@@ -540,3 +541,28 @@ void saveComboHistory(QComboBox* cb,const QString& text) {
     cb->insertItem(0,s);
     cb->setCurrentText(s);
 }
+
+void openFileFolderInExplorer(const QString &path)
+{
+    QFileInfo info(path);
+    if (info.isFile()){
+#ifdef Q_OS_WIN
+        QProcess process;
+        QStringList args;
+        QString filepath=info.absoluteFilePath().replace("/","\\");
+        args.append("/n,");
+        args.append("/select,");
+        args.append(QString("%1").arg(filepath));
+        process.startDetached("explorer.exe",args);
+#else
+        QDesktopServices::openUrl(
+                    QUrl("file:///"+
+                         includeTrailingPathDelimiter(info.path()),QUrl::TolerantMode));
+#endif
+    } else if (info.isDir()){
+        QDesktopServices::openUrl(
+                    QUrl("file:///"+
+                         includeTrailingPathDelimiter(path),QUrl::TolerantMode));
+    }
+
+}
diff --git a/RedPandaIDE/utils.h b/RedPandaIDE/utils.h
index 6986349b..926fcb01 100644
--- a/RedPandaIDE/utils.h
+++ b/RedPandaIDE/utils.h
@@ -124,6 +124,8 @@ QByteArray runAndGetOutput(const QString& cmd, const QString& workingDir, const
                            bool inheritEnvironment = false,
                            const QProcessEnvironment& env = QProcessEnvironment() );
 
+void openFileFolderInExplorer(const QString& path);
+
 void executeFile(const QString& fileName,
                  const QString& params,
                  const QString& workingDir,
diff --git a/libs/qsynedit/qsynedit/qsynedit.cpp b/libs/qsynedit/qsynedit/qsynedit.cpp
index 4beed12c..dca3cee3 100644
--- a/libs/qsynedit/qsynedit/qsynedit.cpp
+++ b/libs/qsynedit/qsynedit/qsynedit.cpp
@@ -230,24 +230,7 @@ void QSynEdit::setCaretXY(const BufferCoord &value)
 
 void QSynEdit::setCaretXYEx(bool CallEnsureCursorPosVisible, BufferCoord value)
 {
-    int nMaxX;
-    if (value.line > mDocument->count())
-        value.line = mDocument->count();
-    if (mActiveSelectionMode!=SelectionMode::Column) {
-        if (value.line < 1) {
-            // this is just to make sure if Lines stringlist should be empty
-            value.line = 1;
-            if (!mOptions.testFlag(EditorOption::eoScrollPastEol)) {
-                nMaxX = 1;
-            } else {
-                nMaxX = getDisplayStringAtLine(value.line).length()+1;
-            }
-        } else {
-            nMaxX = getDisplayStringAtLine(value.line).length()+1;
-        }
-        value.ch = std::min(value.ch,nMaxX);
-    }
-    value.ch = std::max(value.ch,1);
+    value = ensureBufferCoordValid(value);
 //    if ((value.Char > nMaxX) && (! (mOptions.testFlag(SynEditorOption::eoScrollPastEol)) ) )
 //        value.Char = nMaxX;
 //    if (value.Char < 1)
@@ -2119,6 +2102,30 @@ void QSynEdit::doSelectLine()
     setCaretAndSelection(ptBegin,ptBegin,ptEnd);
 }
 
+BufferCoord QSynEdit::ensureBufferCoordValid(const BufferCoord &coord)
+{
+    int nMaxX;
+    BufferCoord value = coord;
+    if (value.line > mDocument->count())
+        value.line = mDocument->count();
+    if (mActiveSelectionMode!=SelectionMode::Column) {
+        if (value.line < 1) {
+            // this is just to make sure if Lines stringlist should be empty
+            value.line = 1;
+            if (!mOptions.testFlag(EditorOption::eoScrollPastEol)) {
+                nMaxX = 1;
+            } else {
+                nMaxX = getDisplayStringAtLine(value.line).length()+1;
+            }
+        } else {
+            nMaxX = getDisplayStringAtLine(value.line).length()+1;
+        }
+        value.ch = std::min(value.ch,nMaxX);
+    }
+    value.ch = std::max(value.ch,1);
+    return value;
+}
+
 void QSynEdit::doDuplicateLine()
 {
     if (!mReadOnly && (mDocument->count() > 0)) {
@@ -2126,9 +2133,9 @@ void QSynEdit::doDuplicateLine()
         if (foldRange && foldRange->collapsed)
             return;
         QString s = lineText();
+        beginEditing();
         mDocument->insertLine(mCaretY, lineText());
         doLinesInserted(mCaretY + 1, 1);
-        beginEditing();
         addCaretToUndo();
         mUndoList->addChange(ChangeReason::LineBreak,
                              BufferCoord{s.length()+1,mCaretY},
@@ -6352,12 +6359,12 @@ void QSynEdit::dropEvent(QDropEvent *event)
         mDropped = true;
         return;
     }
-    if (coord.line<=0 || coord.line>=mDocument->count()) {
-        //do nothing if drag out of range
-        event->acceptProposedAction();
-        mDropped = true;
-        return;
-    }
+//    if (coord.line<=0 || coord.line>=mDocument->count()) {
+//        //do nothing if drag out of range
+//        event->acceptProposedAction();
+//        mDropped = true;
+//        return;
+//    }
 
     int topLine = mTopLine;
     int leftChar = mLeftChar;
@@ -6368,6 +6375,21 @@ void QSynEdit::dropEvent(QDropEvent *event)
     addSelectionToUndo();
     internalSetCaretXY(coord);
     if (event->proposedAction() == Qt::DropAction::CopyAction) {
+        if (coord.line>mDocument->count()) {
+            int line=mDocument->count();
+            QString s=mDocument->getLine(line-1);
+            beginEditing();
+            mDocument->addLine("");
+
+            mUndoList->addChange(ChangeReason::LineBreak,
+                                 BufferCoord{s.length()+1,line},
+                                 BufferCoord{s.length()+1,line}, QStringList(), SelectionMode::Normal);
+            endEditing();
+            coord.line = line+1;
+            coord.ch=1;
+        } else {
+            coord = ensureBufferCoordValid(coord);
+        }
         //just copy it
         doInsertText(coord,text,mActiveSelectionMode,coord.line,coord.line+text.length()-1);
     } else if (event->proposedAction() == Qt::DropAction::MoveAction)  {
@@ -6377,6 +6399,21 @@ void QSynEdit::dropEvent(QDropEvent *event)
             //paste to new position
             doInsertText(coord,text,mActiveSelectionMode,coord.line,coord.line+text.length()-1);
         } else {
+            if (coord.line>mDocument->count()) {
+                int line=mDocument->count();
+                QString s=mDocument->getLine(line-1);
+                beginEditing();
+                mDocument->addLine("");
+
+                mUndoList->addChange(ChangeReason::LineBreak,
+                                     BufferCoord{s.length()+1,line},
+                                     BufferCoord{s.length()+1,line}, QStringList(), SelectionMode::Normal);
+                endEditing();
+                coord.line = line+1;
+                coord.ch=1;
+            } else {
+                coord = ensureBufferCoordValid(coord);
+            }
             //paste to new position
             doInsertText(coord,text,mActiveSelectionMode,coord.line,coord.line+text.length()-1);
             //delete old
diff --git a/libs/qsynedit/qsynedit/qsynedit.h b/libs/qsynedit/qsynedit/qsynedit.h
index 2817040c..a1627080 100644
--- a/libs/qsynedit/qsynedit/qsynedit.h
+++ b/libs/qsynedit/qsynedit/qsynedit.h
@@ -472,6 +472,7 @@ protected:
 protected:
     void doSelectLine();
 private:
+    BufferCoord ensureBufferCoordValid(const BufferCoord& coord);
     void beginEditingWithoutUndo();
     void endEditingWithoutUndo();
     void clearAreaList(EditingAreaList areaList);