Please read the pinned topic How to Request an App if your not certain on how to make a request, then add the necessary info back into this thread.
The more info you supply the better,
What does EFM stand for, Abbreviation's aren't the best to go on when looking for a file.
Does the EFM mean "Elegant Formatted Margins?" "Extra Fax Modules?" I could guess all day, but it would be easier if you; knowing the program, helped as much as possible.
The filename you might think it is, could have changed to the fullname of the program, or someone who gave you the file might have abbreviated the name.
This is why the template is a must to follow, it gives enough info to go on then having to reask you for more info.
What does it have to do with Rightfax? is it a module?