Using YAP in landscape mode

Is there any way of using YAP to display landscape mode?  The help file 
finds nothing under landscape and the various settings do not appear to 
have anything on that.  I am using \documentclass[20pt]{extarticle} to 
prepare transparencies and \landscape is not supported by extarticle.cls 
so I have set the paper size and text size parameters by hand.

For some reason, my pdf viewer has stopped working since I upgraded to the 
latest version of Adobe (it generally hangs up the computer under Win 7 
and requires a reboot, so pdf viewing is not an option).

Michael Barr

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