No "." in your commands.
That is only needed by the shell since the current directory is not in $PATH.
So more something like
QString bin_path
= rx_path
+ "/applications/bin";
QString command
= bin_path
+ "/application";
rx_process->setWorkingDirectory(bin_path);
rx_process
->start
(command,
QStringList() <<
"-udp" <<
"42003");
QString rx_path = QCoreApplication::applicationDirPath();
QString bin_path = rx_path + "/applications/bin";
QString command = bin_path + "/application";
rx_process = new QProcess;
rx_process->setWorkingDirectory(bin_path);
rx_process->start(command,QStringList() << "-udp" << "42003");
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Cheers,
_
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