Installing Arbortext Publishing Engine > Installation Overview > Setup Considerations for Arbortext Publishing Engine > Environment Variables
  
Environment Variables
When you install Arbortext Publishing Engine, it runs under the Windows SYSTEM account. For this reason, environment variables must be set as System variables to be available to the Arbortext Publishing Engine and its Arbortext PE sub-processes.
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The PTC_D_LICENSE_FILE Environment Variable, which must contain the path to the Arbortext Publishing Engine license file, needs to be a System variable. See Arbortext Publishing Engine Licensing for licensing information.