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If i remember correctly it doesn't come with cinematics or mission briefs for campaign mode. I'm guessing that would be a copyright issue.

You can import those from ISOs: https://github.com/OpenRA/OpenRA/wiki/Game-Content but the campaign is not complete afaik as it needs to be re-built in OpenRA: https://github.com/OpenRA/OpenRA/issues/4989 (I think this is the related ticket)

Important to note that EA released C&C, RA1, and Tiberian Sun as freeware so you can just grab the data.