FileUtil.CopyFileOrDirectory  

static function CopyFileOrDirectory (from : String, to : String) : void

Description

Copies a file or a directory.

This function's path can be relative to the project root folder or be an absolute path.

All file separators should be forward ones "/".

Make sure to include the name of the files or directories at the end of the "to" argument.

@MenuItem ("Example/Copy Something")
static function CopyAFile () {
    // copies the file "YourFileOrFolder" from "path/" to "copy/path/"
    FileUtil.CopyFileOrDirectory ("path/YourFileOrFolder", "copy/path/YourFileOrFolder");
}