I assume you mean the fx created within the avid app (otherwise you could just open the .red files from within Boris Red).
I’d pose the question to Boris support … there may be some hidden directory containing the .red files you would need to salvage the effect, but a search on my system only reveals .red files I have saved as such deliberately. You may well be SOL. You’d have to replace the footage anyway as it wouldn’t be able to reference the avid timeline.
I suppose you could open the sequence containing the avidfx on a system that was working and save them out as .red files.
Are you sure that the windows aren’t minimized or somesuch in AvidFX?