Hi,
seems you have a release build, so you need the Qt
libraries without the 'd' suffix (Qt5Core.dll instead of
Qt5Cored.dll). Might be windeployqt is not able to handle
that.
I prefer to use tools/
copydlldeps.sh/py from mxe, it
crawls through the libraries and copies the necessary dll-s
they link with.
Note that it does not copy the plugins you use, so you
should copy those manually, you will at least need the
platform plugin for windows (platforms/qwindows.dll).
You might also need to specify a qt.conf so that Qt knows
where to find them