title: Using Eclipse 3.7 for developing Plugin based on Eclipse RCP 3.5
body: <p>is it possible to use Eclipse 3.7 IDE for developing for the 3.5 platform? Or must I use Eclipse 3.5 IDE?</p>
  
  <p>When I try to switch from Eclipse 3.5 IDE to 3.7 I get errors on projects, which were ok before:
  Archive for required library: 'C:/.../.metadata/.plugins/org.eclipse.pde.core/.external_libraries/xyz/os/win32/x86' in project 'projectname' cannot be read or is not a valid ZIP file  projectname</p>
  
  <p>What do I have to do to exchange the 3.5 IDE with a current one, but still develop for the 3.5 platform?</p>
  
  <p>I hope my explanation did make sense and was understandable :)</p>
  
  <p>Additional Info:
  - I never used the RCP before, now I must use it
  - It's no option to upgrade the target platform (3.5)
  - I searched the net and stackoverflow, but found no answers for using 3.7 and develop for target platform 3.5 (maybe nobody else has these problems or I used the wrong queries)</p>
  
  <p>Cheers<br>
  Kai</p>