ActiveX server unable to load platform plugins on 64-bit Windows

In attempt to load and start the ActiveX server (in form of DLL) there is the following error message:

This application failed to start because it could not find or load the Qt platform plugin "windows".

Available platform plugins are: minimal, windows

Reinstalling the application may fix problem.

All necessary runtime Qt libraries and plug-ins are near with the ActiveX server's dll in deploy dir:

• icudt52.dll
• icuin52.dll
• icuuc52.dll
• libEGL.dll
• libGLESv2.dll
• Qt5Core.dll
• Qt5Gui.dll
• Qt5Network.dll
• Qt5Widgets.dll
• msvcp120.dll
• msvcr120.dll
• platforms/qminimal.dll
• platforms/qwindows.dll
• my_ax_server.dll

If into this (deploy) directory to add the usual GUI application and to start it - that everything works without errors (platform plugins are detected), as on 32-bit OS && 32-bit executable, and as on 64-bit OS && 64-bit executable.

If to rebuild the ActiveX server project with use 32-bit toolchain and to deploy on 32-bit OS (with same set of runtime && platform libraries) - that everything works without errors.

This problem appears only on 64-bit OS with use of 64-bit VS2013 && Qt toolchain.

PS:

Seems, that QPlatformIntegrationFactory::create() returns wrong result (from the qplatformfactory.cpp).

Or

    GetModuleFileName(hInstance, qAxModuleFilename, MAX_PATH);
    // Point QApplication here such that the directory is added to the patch, and qt.conf and
    // deployed plugins are found.
    QCoreApplicationPrivate::setApplicationFilePath(QDir::cleanPath(QString::fromWCharArray(qAxModuleFilename)));

from "qaxserverdll.cpp" does not work property.. Or something else.