无法在DLL的FreeImageNET中找到名为“FreeImage_GetFileTypeU”的入口点

I just downloaded FreeImage 3.15.4 Win32 and I'm trying to go through their C# samples. I have a 64-bit Windows 7 machine with Visual Studio Express 2010, so I recompiled the samples to 64 bit as described here (I just downloaded FreeImage 3.15.4 Win32 and I'