Rar hidden in mp4

[ANTIjailbreak]

hello I was wondering if its possable to hide a rar file in a mp4 file cause im trying to do this then upload that mp4 to facebook and have facebook still read it as a mp4.

 

[LNCPapa]

Sounds like you're trying to use an alternate data stream, but I'm not sure if that fill will retain that info once you've put it up on facebook. It might, but it would pose a security risk so I would block content with those characteristics from being put on my site.