title: Jenkins Pipeline: use Windows environment variable with '(' in it
body: <p>In my Jenkins pipeline I want to access the Windows environment variable named "ProgramFiles(x86)". However, I do not know what syntax I have to use to make Jenkins pipeline understand that the '(x86)' is part of the environment variable name. I keep getting an error with for example "echo env.ProgramFiles(x86)</p>
  
  <pre><code>groovy.lang.MissingPropertyException: No such property: x86 for class: groovy.lang.Binding
  </code></pre>
  
  <p>I also tried</p>
  
  <pre><code>echo "${ProgramFiles(x86)}"
  </code></pre>
  
  <p>and</p>
  
  <pre><code>echo "${env.ProgramFiles(x86)}"
  </code></pre>
  
  <p>but no success there either.</p>