after upgrading from 9.0.2 to 9.1 the parameter defaultapp in config.php ist not working.
I mainly use ownCloud for calendar sharing. So i set defaultapp to "calendar". With ownCloud 9.0.2 and previous releases everything worked fine. After upgrading to 9.1 the parameter has still the same value, but is not working. The webinterface always opens the files-app by default.