When I tried to get them back I did View->Tool Windows->File Tabs, but those are the old/obsolete file tabs. Did not occur to me to go into the Window menu.
Maybe View->Tool Windows->File Tabs should be changed to use these supported file tabs? I know that technically it is not a tool window, but as long time SE user that is where I first looked, and the old File Tabs are obsolete and shouldn't be used anymore. Just a suggestion.