#include <mmsystem.h> and DWORD ?

[nthung]

this is my code

#include <QtCore/QCoreApplication>
#include <mmsystem.h>
int main(int argc, char *argv[])
{
    QCoreApplication a(argc, argv);
[COLOR="Red"]DWORD what;[/COLOR]
    return a.exec();
}

#include <QtCore/QCoreApplication>
#include <mmsystem.h>
int main(int argc, char *argv[])
{
    QCoreApplication a(argc, argv);
[COLOR="Red"]DWORD what;[/COLOR]
    return a.exec();
}

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but it gives me an error"DWORD is not a type name" why is wrong?
thanks