Qt - Visual Studio 2013 Add-in won't compile the project - c++

Question

I've installed these files from their site:
Qt 5.3.1 for Windows 64-bit (VS 2013, OpenGL, 571 MB)
Visual Studio Add-in 1.2.3 for Qt5
After that, I tried to follow this simple tutorial but when I try to actually build the generated project it fails at linking saying "error LNK1112: module machine type 'X86' conflicts with target machine type 'x64'". I did exactly as the guy in the tutorial says, changed the Target Machine to Machine64 and set the platform to be x64. If I try to build it as Win32, the following message box pops up.:
I've set the "Qt Version" path to C:\Qt\Qt5.3.1\5.3\msvc2013_64_opengl. Maybe that's what's bothering the linker? On a side note, I have three projects in the solution - two of them are x86 and the Qt one is x64.
UPDATE: Everything works just fine in Qt Creator.
UPDATE 2: Qt project's vcxproj.user file:
<?xml version="1.0" encoding="utf-8"?>
<Project ToolsVersion="12.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
<PropertyGroup>
<ShowAllFiles>true</ShowAllFiles>
</PropertyGroup>
<PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'">
<QTDIR>C:\Qt\Qt5.3.1\5.3\msvc2013_64_opengl</QTDIR>
<LocalDebuggerEnvironment>PATH=$(QTDIR)\bin%3b$(PATH)</LocalDebuggerEnvironment>
</PropertyGroup>
<PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|Win32'">
<QTDIR>C:\Qt\Qt5.3.1\5.3\msvc2013_64_opengl</QTDIR>
<LocalDebuggerEnvironment>PATH=$(QTDIR)\bin%3b$(PATH)</LocalDebuggerEnvironment>
</PropertyGroup>
<PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|x64'">
<LocalDebuggerEnvironment>PATH="$(QTDIR)\bin%3b$(PATH)</LocalDebuggerEnvironment>
<QTDIR>C:\Qt\Qt5.3.1\5.3\msvc2013_64_opengl</QTDIR>
</PropertyGroup>
<PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|x64'">
<LocalDebuggerEnvironment>PATH="$(QTDIR)\bin%3b$(PATH)</LocalDebuggerEnvironment>
<QTDIR>C:\Qt\Qt5.3.1\5.3\msvc2013_64_opengl</QTDIR>
</PropertyGroup>
</Project>

Answer 1

Solved by exchanging the x64 edition of Qt with the x86 one. The project builds and runs as expected.

Answer 2

Your issue is that both 32 bit and 64 bits of your app are configured to link with Qt 64 bits. The 32 bit version requires Qt 32 bits and the 64 bit version requires Qt 32 bit. A successful configuration would set <QTDIR> to C:\Qt\Qt5.3.1\5.3\msvc2013_32_opengl on win32 and C:\Qt\Qt5.3.1\5.3\msvc2013_64_opengl on x64.