Do you think there's a plot out there to shut apple/mac users out of the MS universe?
There is a plot by Microsoft to get web developers to use their tools which have proprietary technologies and extensions which make something work fine in Microsoft's own Windows but not on other platforms. This might be a good marketing strategy, but it is not a good strategy for a standards-based Internet.
Rather than going after Microsoft, the web developers need to be made to realize they are locking out potential customers and users by not coding to standards. I have seen two reactions from developers. One is "let's fix it" and the other is "I don't care - get a pc".
In your particular case, however, part of the problem is that Microsoft has not upgraded its own Windows Media Player to have the same capabilities as the most recent two versions for Windows.