Why i'm getting System.IO.FileLoadException?

In form1 designer I have menustrip with Open menu.

Just dragged from toolbox menustrip added Open menu.

when running the program and clicking the Open I can't use a break point it's not even get there but throw this exception first:

Could not load file or assembly 'Microsoft.DirectX.AudioVideoPlayback.dll' or one of its dependencies. is not a valid Win32 application. (Exception from HRESULT: 0x800700C1)

The exception is in Program.cs on the line

Application.Run(new Form1());

Not sure what is going on here. Maybe something messed up with the designer ? My project is set to .net 4.5 and to Any CPU I tried to set it to .net 4 and to x86 but same exception.