If converting any of these files is required it will give me pause when/if the drone is ever available in the U.S. Really dumb on DJI's part as far as I'm concerned. Did anyone try the "change the file type" trick?
I have no experience with All-I but try this old school trick. I don't know what the .xxx file type is but try changing it to .mov or .mp4 and see if FCP can then see it. That simple thing can sometimes make a file type be able to be opened...