Can't select Platform x64 in Visual Studio 2010
<p>In my solution I am importing external projects which I use as references. After coding and setting Release x64 (in Standard toolbox) I got a problem with build. The problem is for sure related to x64/x86 configuration. When I go to properties of the solution and projects as well, all of them are set to x64 except my project. Finally, the problem is that I can't choose x64. Has anyone faced with this kind of problem? The error message is:</p>

<blockquote>
  <p>Could not load file or assembly … An attempt was made to load a
  program with an incorrect format (System.BadImageFormatException)</p>
</blockquote>

<p>The preview is also here...</p>

<p><a href="https://i.stack.imgur.com/veyOp.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/veyOp.png" alt="enter image description here"></a></p>