diff --git a/NEWS.md b/NEWS.md
index 65017fd4..42c4afd4 100644
--- a/NEWS.md
+++ b/NEWS.md
@@ -5,6 +5,7 @@ Red Panda C++ Version 2.23
   - enhancement: Tooltip support for '->' operator on std iterators.
   - enhancement: Close other editors.
   - fix: Goto definition/Goto declaration/Info tips can't be correctly triggered when mouse pointer is at the last half character of current word.
+  - fix: Use "/" as path seperator when starting app by double clicking c/c++ files in the explorer.
 
 Red Panda C++ Version 2.22
 
diff --git a/RedPandaIDE/mainwindow.cpp b/RedPandaIDE/mainwindow.cpp
index 2152ba86..850d3c52 100644
--- a/RedPandaIDE/mainwindow.cpp
+++ b/RedPandaIDE/mainwindow.cpp
@@ -1453,10 +1453,15 @@ void MainWindow::openFiles(const QStringList &files)
         e->activate();
 }
 
-Editor* MainWindow::openFile(const QString &filename, bool activate, QTabWidget* page)
+Editor* MainWindow::openFile(QString filename, bool activate, QTabWidget* page)
 {
     if (!fileExists(filename))
         return nullptr;
+
+    QFileInfo info=QFileInfo(filename);
+    if (info.isAbsolute())
+        filename = info.absoluteFilePath();
+
     Editor* editor = mEditorList->getOpenedEditorByFilename(filename);
     if (editor!=nullptr) {
         if (activate) {
@@ -1501,11 +1506,14 @@ Editor* MainWindow::openFile(const QString &filename, bool activate, QTabWidget*
     return nullptr;
 }
 
-void MainWindow::openProject(const QString &filename, bool openFiles)
+void MainWindow::openProject(QString filename, bool openFiles)
 {
     if (!fileExists(filename)) {
         return;
     }
+    QFileInfo info=QFileInfo(filename);
+    if (info.isAbsolute())
+        filename = info.absoluteFilePath();
     Editor* oldEditor=nullptr;
     if (mProject) {
         if (mProject->filename() == filename)
diff --git a/RedPandaIDE/mainwindow.h b/RedPandaIDE/mainwindow.h
index 1a0326cf..3421401a 100644
--- a/RedPandaIDE/mainwindow.h
+++ b/RedPandaIDE/mainwindow.h
@@ -221,8 +221,8 @@ public:
 
     TodoModel* todoModel();
 
-    Editor* openFile(const QString& filename, bool activate=true, QTabWidget* page=nullptr);
-    void openProject(const QString& filename, bool openFiles = true);
+    Editor* openFile(QString filename, bool activate=true, QTabWidget* page=nullptr);
+    void openProject(QString filename, bool openFiles = true);
     void changeOptions(const QString& widgetName=QString(), const QString& groupName=QString());
     void changeProjectOptions(const QString& widgetName=QString(), const QString& groupName=QString());