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You really need to determine how big the file is and what type it is.
If you have a 200 MB file, for instance, that would not be something you could readily email to someone. If it's a file from iMovie or something specific to Mac, you'd have a problem giving it to someone on Windows, and vice versa with certain Windows file types.
So, first, see if you can determine the size. Also, how did you create it?