Problem with QFile::exists() (and QFileInfo::exists()) for localized filenames

#include <QApplication>
#include <QFileInfo>
#include <QString>
#include <QTextCodec>
#include <stdio.h>

int main(int argc, char **argv)
{
	QApplication app(argc, argv);
	QString f;
	QFileInfo fi;
	QTextCodec *UTF8Codec=QTextCodec::codecForName("UTF-8");
	QTextCodec::setCodecForCStrings(UTF8Codec);
	f="/mnt/external_a1/файл";
	printf("%d\n", QFile::exists(f));
	return app.exec();
}

	QTextCodec::setCodecForCStrings(UTF8Codec);