Check out some options how yify files might be converted to mp4 format.
It is likely that your .yify file is already an MP4 file (or some other multimedia format) and you just have known file extensions hidden in your system.
If you want to see the extensions, check one of our articles that deals with this topic : How to show extensions in Windows, which should help you to reverse the situation and see your extensions.
Updated: September 9, 2016
Unfortunately, there is no detailed software record in the database for this conversion.
Articles and other information relating to yify into mp4 conversion:
How to make all file extensions visible in Windows Explorer - Showing hidden file extensions in Windows 7 and Vista
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