sorry if this is the wrong place to ask, but what is the best way to give someone a clip

What is the best way to give someone the original video files, assuming you have used the card from the camera and that isn't an option. I have them imported through FCPX and I have opened the library container and went to the original media folder to the clips and I just copy them to a thumb drive and off they go. They were shot on a sony fs5 mxf files which FCPX re-wraps to .mov however my older laptop won't play them via quicktime. They will however play on my iMac and my Mac Pro via quicktime so maybe my older MacBook pro, which is on 10.10.5 may need a plug-in? My other computer is a newer MacBook pro running el captain and it won't play the clip through quicktime either.
If this isn't the right way to give someone the clip, what would your advise be.
Sorry if this isn't the right place to ask.

Thanks for the help