Start a process using QProcess

may be code below will help you:

QProcess *process = new QProcess(this);
QString program = "explorer.exe";
QString folder = "C:\\";
process->start(program, QStringList() << folder);

I think you are trying to execute program that doesn't consists in global $PATH windows variable, that's why winword.exe doesn't executes.

Also you may need to define absolute path to program, e.g.:

QString wordPath = "C:\\Program Files\\Microsoft Office\\Office12\\WINWORD.EXE"
process->start(wordPath, QStringList() << "");

For me, I need to add " characteres :

m_process->start("\"C:\\Program Files (x86)\\Notepad++\\notepad++.exe\"");

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