QTextStream writes extra text at the end of a file

Windows Registry Editor Version 5.00[HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows NT\CurrentVersion\AppCompatFlags\Layers]
"C:\\Users\\Roger\\source\\repos\\Projects\\ImageViewers\\Tinta\\debug\\Tinta.exe"="RUNASADMIN"
"

QString writeRegistry()
{
    const QDir writableQDir = QStandardPaths::writableLocation(QStandardPaths::AppDataLocation);    
QString applicationPath     = QDir().toNativeSeparators(QCoreApplication::applicationDirPath());
QString applicationFilePath = QCoreApplication::applicationFilePath();    
QString registryLocation = writableQDir.absolutePath();    
QString registryFileName = registryLocation + "/RegisterTinta.reg";    applicationFilePath.replace("/", "\\\\");    
QFile file(registryFileName);
    if (file.open(QIODevice::ReadWrite))
    {
        QTextStream stream(&file);
        stream << "Windows Registry Editor Version 5.00\n\n";
        stream << "[HKEY_CURRENT_USER\\SOFTWARE\\Microsoft\\Windows NT\\CurrentVersion\\AppCompatFlags\\Layers]\n";
        QString registryEntry = QString('"') + applicationFilePath + "\"=\"RUNASADMIN\"\n";        stream << registryEntry;        file.close();
        return registryFileName;
    }
    else
    {
        return {};
    }
}