I think if you look at the Task Scheduler system app, you will see that the weekly trigger (WeeklyTrigger) and the monthly days trigger (MonthlyDOWTrigger) are the only ones that support the specifying of week days. The DailyTrigger only supports an interval. You could always use the TaskDefinition.Data property to store something that will distinguish tasks for your application. It is supported across all operating systems.
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