title: The GAC, gacutil.exe and Assembly Cache Viewer
body: <p>I'm new to .NET and I have few simple questions regarding the GAC. </p>
  
  <p>First of all, as far as I understand the GAC in .NET 3.5 is different from the GAC in .net 4.0 . </p>
  
  <p>I also know that there are two main tools for managing the GAC : gacutil and Assembly Cache Viewer which is integrated in Windows Explorer. So my questions are the following : </p>
  
  <ul>
  <li>Why is Assembly Cache Viewer obsolete in .NET 4.0 ? </li>
  <li>I have installed .NET 4.0 and I have to GACs. How to tell gacutil.exe to target only one of the GACs ? </li>
  <li>I guess there are many duplicate assemblies in the two GACs am I right ? </li>
  </ul>
  
  <p>Thank you in advance</p>