Use compatible shlex_quote to handle case where Windows needs double quotes around file names, not single quotes. Ref https://github.com/GNS3/gns3-gui/issues/2866

gns3server/compute/dynamips/nodes/router.py

@@ -806,7 +806,7 @@ class Router(BaseNode):
         """
 
         await self._hypervisor.send('vm set_ghost_file "{name}" {ghost_file}'.format(name=self._name,
-                                                                                          ghost_file=shlex.quote(ghost_file)))
+                                                                                     ghost_file=shlex.quote(ghost_file)))
 
         log.info('Router "{name}" [{id}]: ghost file set to {ghost_file}'.format(name=self._name,
                                                                                  id=self._id,