doc/app_nextcloud_keeweb.md

The KeeWeb application

The KeeWeb application is a password manager integrated into Nextcloud. For example, it allows you to read a KeePass file (.kdbx) stored on your Nextcloud instance. But sometimes Nextcloud does not let the application support these files, which makes it impossible to read them from KeeWeb. To remedy this, a solution exists.

Go to the Nextcloud configuration directory:

cd /var/www/nextcloud/config/

If it does not exist, create the mimetypemapping.json file whose owner is the user nextcloud :

sudo su nextcloud -c "nano mimetypemapping.json"

Then add in this file the following text:

{
    "kdbx": ["x-application/kdbx"]
}

Save the file (CTRL + o) and exit nano (CTRL + c).

Now the problem is fixed.