title: Eclipse, compile a 32-bit project for 64-bit settings
body: <p>I have been workin' on a Java project with Eclipse on my 32-bit Windows Xp pc. This project relates to another C++ project, developed with Visual Studio 2008, through Java Native Interface (JNI).
  Now I have moved my projects on a 64-bit Windows 7 pc.</p>
  
  <p>The compilin' of the C++ project on Visual Studio is alright, but if I try to compile my Java project on Eclipse, that's what I get:</p>
  
  <blockquote>
    <p>Exception in thread "Thread-3" java.lang.UnsatisfiedLinkError:
    C:\Users\Desktop\temp\BioTesi\BioCpp.dll: %1 is not a valid Win32 application</p>
  </blockquote>
  
  <p>I think that the problem is that the project is set for a 32-bit architercture, while now it does not "know" that it's workin' on a 64-bit architecture.</p>
  
  <p>How could I set, on Eclipse, the fact "This project must be compiled 64-bit way"?</p>
  
  <p>Thank you very much </p>