Re-use Ansible vault file in different groups - ansible

Question

I want to extend my current Ansible project to also support Linux servers. For that I want to re-use the vault file I have created but I cannot seem to find a solution without duplicating the vault file.
Here's what my current Ansible structure looks like
├── ansible.cfg
├── ansible_pw.sh
├── group_vars
│   └── windows
│   ├── vault.yml
│   └── main.yml
├── inventory.yml
├── main.yml
└── roles
├── wait_for_host
│   └── tasks
│   └── main.yml
└── install_software
   └── tasks
   └── main.yml
inventory.yml
---
all:
children:
windows:
hosts:
win-server.mycompany.com
main.yml
---
- hosts: windows
tasks:
- block:
- include_role: { name: wait_for_host }
- include_role: { name: install_software }
Playbook is run like this:
ansible-playbook main.yml -i inventory.yml --vault-password-file ./ansible_pw.sh
My idea is to create a new group_vars/linux directory which contains all specific settings which only apply for linux servers.

Answer 1

While writing this question I actually found neat solution. All general settings (including the vault file) can be stored in the default all group (see https://docs.ansible.com/ansible/latest/user_guide/intro_inventory.html#default-groups) and all Windows/Linux specific settings (like ansible_connection) can be stored in separate directories:
group_vars
├── all
│ ├── main.yml
│ └── vault.yml
├── linux
│ └── main.yml
└── windows
└── main.yml