Link to file in an outside folder

Is it possible to link to a file in a folder outside of the output folder. The course that I am designing will be on a network server but will not have Internet access. This course links to another large course written in html and containing a variety of file types in a number of folders. That course will be located on the sane server in a different folder. I do not really want to encode it by putting it in the external_files folder.

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