code: def paths_list():
          
  
          paths = set()
          try:
              paths.add(os.getcwd())
          except FileNotFoundError:
              log.warning("The current working directory doesn't exist")
          if "PATH" in os.environ:
              paths.update(os.environ["PATH"].split(os.pathsep))
          else:
              log.warning("The PATH environment variable doesn't exist")
          # look for Qemu binaries in the current working directory and $PATH
          if sys.platform.startswith("win"):
              # add specific Windows paths
              if hasattr(sys, "frozen"):
                  # add any qemu dir in the same location as gns3server.exe to the list of paths
                  exec_dir = os.path.dirname(os.path.abspath(sys.executable))
                  for f in os.listdir(exec_dir):
                      if f.lower().startswith("qemu"):
                          paths.add(os.path.join(exec_dir, f))
  
              if "PROGRAMFILES(X86)" in os.environ and os.path.exists(os.environ["PROGRAMFILES(X86)"]):
                  paths.add(os.path.join(os.environ["PROGRAMFILES(X86)"], "qemu"))
              if "PROGRAMFILES" in os.environ and os.path.exists(os.environ["PROGRAMFILES"]):
                  paths.add(os.path.join(os.environ["PROGRAMFILES"], "qemu"))
          elif sys.platform.startswith("darwin"):
              if hasattr(sys, "frozen"):
                  # add specific locations on Mac OS X regardless of what's in $PATH
                  paths.update(["/usr/bin", "/usr/local/bin", "/opt/local/bin"])
                  try:
                      exec_dir = os.path.dirname(os.path.abspath(sys.executable))
                      paths.add(os.path.abspath(os.path.join(exec_dir, "../Resources/qemu/bin/")))
                  # If the user run the server by hand from outside
                  except FileNotFoundError:
                      paths.add("/Applications/GNS3.app/Contents/Resources/qemu/bin")
          return paths
docs: Gets a folder list of possibly available QEMU binaries on the host.
  
          :returns: List of folders where Qemu binaries MAY reside.