I cant help with finding the file itself, as other guides do that better (look up increasing Sims 2's resolution, there are plenty of guides out there) but once you find the graphicsrules file, you have to open it with notepad, and search for the max number of visitors line, and set all examples of it to 8 or higher. I go with 8, as its the EA default for a high end computer back then.
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