Starting this month, MS Rewards has begun rolling out a new "PC Weekly Bonus" to users in certain regions, which allows them to earn up to 1000 points per-month for playing Xbox games on PC for at least five days a week.
This is essentially the same thing as the Weekly Console Bonus that was debuted at the start of the year.
Based on the comments we've been seeing, it looks like this new PC Weekly Bonus is only available in Germany and Mexico as things stand, but we're presuming it'll roll out to other regions in the near future.
It remains to be seen how generous it'll be in the likes of the UK though, where the Weekly Console Bonus recently reduced the number of points you could earn. In any case, you'll hopefully be getting some extra points from this soon!