diff --git a/NEWS.md b/NEWS.md
index 65462927..6fc0edc1 100644
--- a/NEWS.md
+++ b/NEWS.md
@@ -3,6 +3,7 @@ Red Panda C++ Version 3.2
   - Change: The way to calcuate astyle path.
   - fix: Scroll bar arrow size not correct in the dark themes.
   - fix: Don't auto scroll to the caret after undo/redo.
+  - fix: "bits/stdc++" is not openned in readonly mode.
 
 Red Panda C++ Version 3.1
 
diff --git a/RedPandaIDE/parser/cppparser.cpp b/RedPandaIDE/parser/cppparser.cpp
index 66da1f92..c7dbadc5 100644
--- a/RedPandaIDE/parser/cppparser.cpp
+++ b/RedPandaIDE/parser/cppparser.cpp
@@ -107,7 +107,7 @@ void CppParser::addHardDefineByLine(const QString &line)
 void CppParser::addIncludePath(const QString &value)
 {
     QMutexLocker  locker(&mMutex);
-    mPreprocessor.addIncludePath(includeTrailingPathDelimiter(value));
+    mPreprocessor.addIncludePath(value);
 }
 
 void CppParser::removeProjectFile(const QString &value)
@@ -121,7 +121,7 @@ void CppParser::removeProjectFile(const QString &value)
 void CppParser::addProjectIncludePath(const QString &value)
 {
     QMutexLocker  locker(&mMutex);
-    mPreprocessor.addProjectIncludePath(includeTrailingPathDelimiter(value));
+    mPreprocessor.addProjectIncludePath(value);
 }
 
 void CppParser::clearIncludePaths()
@@ -897,7 +897,7 @@ QSet<QString> CppParser::internalGetFileUsings(const QString &filename) const
 QString CppParser::getHeaderFileName(const QString &relativeTo, const QString &headerName, bool fromNext) const
 {
     QMutexLocker locker(&mMutex);
-    QString currentDir = includeTrailingPathDelimiter(extractFileDir(relativeTo));
+    QString currentDir = extractFileDir(relativeTo);
     QStringList includes;
     QStringList projectIncludes;
     bool found=false;
diff --git a/RedPandaIDE/parser/parserutils.cpp b/RedPandaIDE/parser/parserutils.cpp
index ccc9f357..e76e065d 100644
--- a/RedPandaIDE/parser/parserutils.cpp
+++ b/RedPandaIDE/parser/parserutils.cpp
@@ -494,7 +494,8 @@ bool isSystemHeaderFile(const QString &fileName, const QSet<QString> &includePat
     bool isFullName = false;
 
 #ifdef Q_OS_WIN
-    isFullName = fileName.startsWith("/") || (fileName.length()>2 && fileName[1]==':');
+    isFullName = fileName.startsWith("/") || (fileName.length()>2 && fileName[1]==':'
+            && fileName[0].isLetter());
 #else
     isFullName = fileName.startsWith("/");
 #endif
@@ -503,7 +504,7 @@ bool isSystemHeaderFile(const QString &fileName, const QSet<QString> &includePat
         // If it's a full file name, check if its directory is an include path
         if (info.exists()) { // full file name
             QDir dir = info.dir();
-            QString absPath = includeTrailingPathDelimiter(dir.absolutePath());
+            QString absPath = dir.absolutePath();
             foreach (const QString& incPath, includePaths) {
                 if (absPath.startsWith(incPath))
                     return true;
diff --git a/RedPandaIDE/utils.cpp b/RedPandaIDE/utils.cpp
index 9fe3dadd..2dd692ca 100644
--- a/RedPandaIDE/utils.cpp
+++ b/RedPandaIDE/utils.cpp
@@ -562,7 +562,7 @@ void openFileFolderInExplorer(const QString &path)
 #ifdef Q_OS_WIN
         QProcess process;
         QStringList args;
-        QString filepath=info.absoluteFilePath().replace("/","\\");
+        QString filepath=QDir::toNativeSeparators(info.absoluteFilePath());
         args.append("/n,");
         args.append("/select,");
         args.append(QString("%1").arg(filepath));