[higherpurpose]

Silverlight didn't last decades.

[jorgem]

I don't think that's the same thing. If Microsoft came out with a newer version of silverlight, you'd expect it to keep reading the old files.

The fact they canceled silverlight and won't make a new version, doesn't have much to do with backwards compatibility.

[jessaustin]

Did anyone expect it to? Perhaps if it had seen the same interest from developers that other products have, it would have been supported longer...