Is the property responsible for the maintenance of doors and windows?

Legally speaking, the property is not responsible for the maintenance of doors and windows of individual families, but for the maintenance of doors and windows of public areas.

In practice, it depends on whether the property company assists the developer in this service. If there is such an agreement between them, the property company is assisting the developer to repair the doors and windows of the house, not the natural obligation of the property company.