I've had FF set to automatically open WMV links in WMP when I click them and it's been working fine for quite a while. Now I've installed the final build of 1.5 and it asks me every time I click one if I want to play it in WMP. It's set to WMP as default and the link to use this selection everytime is already checked, but still it asks. Seems like I recall it doing this quite some time back as well and it suddenly went away. Anyone else have this issue? MPG seems to open fine on its own.