Using Tools Folder Options from an Explorer window I can associate MP4
video files in XP with various programs. Such as Windows Media Player,
Media Player Classic, VLC, etc. D-clicking or using Open With then plays
these video files as you'd expect.

But when I then try to open a hyperlink to such a file in Excel 2000, I
get the rather unhelpful message "An unexpected error has occurred."

So far this seems to be confined to MP4 types. MPG work OK. What is the
likely explanation please? Are MP4s perhaps outside Excel 2000's scope?

--
Terry, East Grinstead, UK