I’ve made an app for opening files directly in Office Win. If you got Office licenses like us, no need of Collabora or these solutions.
Actually it just opens the files in Office when clicking on names. You can also save by clicking on the disk button.
Be carefull, when you use old versions of office (<=2010), you have to use old SSL3/TLS1 certs in Apache ssl.conf.
If you are using non secure server (HTTP), you have to add registry keys to make it works.
Thanx for reporting bugs and also comments.
The GitHub Projet