Hi dortmunder,
You'll not be able to run those games in Calc in OpenOffice as they seem to require VBA (Visual Basic for Applications) that only works with Microsoft Office. Calc uses Openoffice Basic that is the same principle as VBA (ie. to control the application) but is a different language so one is not compatible with the other.
There are converters to convert VBA to OpenOffice Basic but your mileage will vary. A quick Google found this site and there will likely be many others. As I said though, your mileage will vary depending on what the game does. Maybe worth a try though.
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