Important: Please read the Qt Code of Conduct - https://forum.qt.io/topic/113070/qt-code-of-conduct
Cannot load library qwt_designer_plugin.dll is not a valid win32 application
drunkwolfs last edited by drunkwolfs
Visual Studio 2013 x64
Qt 5.5 x64
I built qwt module for 64 bit Windows OS:
I run "VS2013 x64 Native Tools Command Prompt"
nmake nmake install
I copied qwt_designer_plugin.dll in C:/Qt/Qt5.5.1/Tools/QtCreator/bin/plugins/designer/
and run Qt Creator
Cannot load library C:/Qt/Qt5.5.1/Tools/QtCreator/bin/plugins/designer/qwt_designer_plugin.dll: %1 is not a valid win32 application
In Qt Designer good load qwt_designer_plugin.dll module.
If you Open Creator and look in Help->About Creator
What version of visual studio is it compiled with?
drunkwolfs last edited by
@mrjj, hm "Qt Creator 3.5.1 Based on Qt 5.5.1 (MSVC 2013, 32 bit)
whether there is a 64 bit version of Qt Creator for Windows?
Qt Creator 3.5.1 for Windows (79 MB) (info) Qt Creator 3.5.1 for Linux/X11 32-bit (103 MB) (info) Qt Creator 3.5.1 for Linux/X11 64-bit (96 MB) (info) Qt Creator 3.5.1 for Mac (84 MB) (info)
Dont think there is one.
Im wondering if it will load 64 bit DLLS when its 32 app.
(guessing its a no go)
No there's no 64 bit pre-built QtCreator.
And no again, a 32bit application can't load a 64 bit plugin/dll. You have to ensure that you use the same compiler and Qt version that were used to build QtCreator.