QSettings - where is the location of the ini file?

I'm using QSettings to store some data as ini file in Windows. I want to see the ini file, but I don't know what is the location of the ini file.

This is my code:

QSettings *set = new QSettings(QSettings::IniFormat, QSettings::UserScope, "bbb", "aaa");
set->setValue("size", size());
set->setValue("pos", pos());

Where do I have to look? Or may be I miss the code which write it to the file? When does the QSettings write its values?