diff --git a/src/blackmisc/fileutils.cpp b/src/blackmisc/fileutils.cpp
index bcb30bae3..d1d0dccd1 100644
--- a/src/blackmisc/fileutils.cpp
+++ b/src/blackmisc/fileutils.cpp
@@ -17,6 +17,7 @@
 #include <QFlags>
 #include <QIODevice>
 #include <QList>
+#include <QLockFile>
 #include <QTextStream>
 #include <QtGlobal>
 #include <algorithm>
@@ -48,6 +49,13 @@ namespace BlackMisc
         return true;
     }
 
+    bool CFileUtils::writeStringToLockedFile(const QString &content, const QString &fileNameAndPath)
+    {
+        QLockFile lock(fileNameAndPath + ".lock");
+        lock.lock();
+        return writeStringToFile(content, fileNameAndPath);
+    }
+
     QString CFileUtils::readFileToString(const QString &fileNameAndPath)
     {
         QFile file(fileNameAndPath);
@@ -58,11 +66,23 @@ namespace BlackMisc
         return content;
     }
 
+    QString CFileUtils::readLockedFileToString(const QString &fileNameAndPath)
+    {
+        QLockFile lock(fileNameAndPath + ".lock");
+        lock.lock();
+        return readFileToString(fileNameAndPath);
+    }
+
     QString CFileUtils::readFileToString(const QString &filePath, const QString &fileName)
     {
         return readFileToString(appendFilePaths(filePath, fileName));
     }
 
+    QString CFileUtils::readLockedFileToString(const QString &filePath, const QString &fileName)
+    {
+        return readLockedFileToString(appendFilePaths(filePath, fileName));
+    }
+
     bool CFileUtils::writeStringToFileInBackground(const QString &content, const QString &fileNameAndPath)
     {
         if (fileNameAndPath.isEmpty()) { return false; }
diff --git a/src/blackmisc/fileutils.h b/src/blackmisc/fileutils.h
index 01ad13919..1c0c6d67d 100644
--- a/src/blackmisc/fileutils.h
+++ b/src/blackmisc/fileutils.h
@@ -41,12 +41,21 @@ namespace BlackMisc
         //! Write string to text file
         static bool writeStringToFile(const QString &content, const QString &fileNameAndPath);
 
+        //! Write string to file, with a lock so two applications can't access at the same time
+        static bool writeStringToLockedFile(const QString &content, const QString &fileNameAndPath);
+
         //! Read file into string
         static QString readFileToString(const QString &fileNameAndPath);
 
+        //! Read file into string, with a lock so two applications can't access at the same time
+        static QString readLockedFileToString(const QString &fileNameAndPath);
+
         //! Read file into string
         static QString readFileToString(const QString &filePath, const QString &fileName);
 
+        //! Read file into string, with a lock so two applications can't access at the same time
+        static QString readLockedFileToString(const QString &filePath, const QString &fileName);
+
         //! Write string to text file in background
         static bool writeStringToFileInBackground(const QString &content, const QString &fileNameAndPath);