I had to look up what a BIF file was, thinking it might be an image or video file. Nope, it's simply an archive format, like ZIP or GZ. Apparently it's normally used to contain terrain descriptions for games.
What on earth are you trying to do with a Roku device with this sort of file? If you're trying to play something contained within a BIF file, that won't work. Roku devices cannot access archive files for any purpose.
If you are attempting to use the file within an app/channel you are creating for Roku devices, you need to ask the question in the Developers area, not here in the users forum.
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