Windows 10/11 C++ QT6 debug needed to use QProcess::startDetached to launch a .exe from it's path with no arguments

I am not experienced enough with C++ and QT6 to sort it fast.
My current code is

void lanceapps (){
//QProcess::startDetached("notepad.exe");//this works like a charm
//QProcess::startDetached("\"C:\\Program Files\\Signalyst\\HQPlayer 5 Desktop\\HQPlayer5Desktop.exe\"");// does not work

QProcess *HQPprocess = new QProcess();
HQPprocess->setProgram("C:\\Program Files\\Signalyst\\HQPlayer 5 Desktop\\HQPlayer5Desktop.exe");
HQPprocess->startDetached();
//does not work
}