structure:
1st try:
/App/app.exe
/App/QtCore4.dll
/App/QtGui4.dll
/App/QtNetwork4.dll
/App/QtSql4.dll
/App/QtWebkit4.dll
/App/QtXmlPatterns4.dll

/App/qsqlmysql4.dll


2nd try:

/App/app.exe
.
.
.
/App/sqldrivers/qsqlmysql4.dll

3rd try:
/App/app.exe
.
.
.
/App/plugins/sqldrivers/qsqlmysql4.dll

everytime i got the message that the driver is missing, if its also removed from the qt-path