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I'd probably use "a custom map is a ZIP file that contains: <list contents>" because "that" is the restrictive clause, and because I like bulleted lists where possible.
Do good and be well,
> From: Yves Barbion <yves -dot- barbion -at- gmail -dot- com>
>Which do you prefer and why:
>[a] A custom map is a ZIP file containing the following...
>[b] A custom map is a ZIP file which contains the following...
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