ghc-5.02 refuses to open a device file

[Max A . K .]

I guess it's a [mis]feature, since 5.00 worked, but can hardly
imagine anybody could need it.

=======
Prelude> h<-IO.openFile "/dev/zero" IO.ReadMode
*** Exception: unsupported operation
Action: openFile
Reason: unknown file type
File: /dev/rtf0
Prelude> Leaving GHCi.
max@max$cat /dev/zero
<C-C>
=======

Max.