Nautilus: where do you want to go today?

The new spatial nautilus is generally nice, but sometimes the mime type detection messes up.
This time I had an sftp: location open, where I have a symlink to another folder on the remote server. First the symlink is shown as a file of an unknown type, but when I double click on it to open the folder, I get an error message that, to say the least, is not very helpful.
What is exactly the correct extension for “Folder” and if I open the “Open with” menu, there nothing there.
What am I supposed to do?
Is there really no way I open the remote folder?
UPDATE: the bug report is here, so I’m not alone.
UPDATE 2: I have another file, a Gnumeric file, which is regularly, but not always, recognised as a “TeX font metrics” file. I have no idea why, but it must be some pattern of bytes in its content that triggers this faulty identification. At least in this case I can open it via the “Open with” menu.