The file name shown on the bottom line in Viewer Mode: Maximize stays always at the first file loaded.
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Your screen shot shows the standard IMatch status bar. This will not change because when you work in the Viewer, you don't change the selected file in the file window - and this is what the status bar shows.
The Viewer has it's own status bar which you can toggle via <T>,<B>.
In this case can I suggest that the info bar shown at the top in Windows Mode, which shows
an index x/y and the file name, also shows the rating.
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I have moved this to feature requests and changed the thread title.
The Viewer already displays the rating in the Collection overlay (<T>,<C>)