Adding "[...]/mingw73_32/bin" to PATH worked! Thank you

@SaundersB Would you be able yo share the sample code as to how you managed to solve this issue? I tried for 2 days now and the only working solution I found was to copy the QT dlls to my project. Regards Dariusz

You're welcome ! Since everything is working now, please mark the thread as solved so other forum users may know a solution has been found :)