CastUP is a popular company among websites which provide online video, and many of them use it to stream their videos.

However, it does not run on n900 - any access to that kind of streaming video opens the built-in media player which gives a "media not supported" message.

According to their diagnostic page, Window Media Player is required (?!).

Any way to workaround this?

CastUP delivering content in multiple technologies (based on the customer needs) - flash / wmv /smooth streaming etc..
Is it a specific video or site that you are watching ?