PowerDVD cannot detect video acceleration when "Extend Desktop" is active.

Cyberlink's PowerDVD XP can detect my hardware video accelerator fine when I
do not have "Extend my windows desktop onto this monitor" selected within my
display settings (dualview). I have an ATI Radeon 8500 All-In-Wonder
running on an Abit SH6, PIII Slot 1 800EB, 512MB SDRAM and Windows XP
Professional. When I select "Extend my windows desktop onto this monitor"
and run Cyberlink's PowerDVD XP it can no longer detect my video
accelerator, resulting in poor DVD performance. My first monitor is a
ViewSonic Flat CRT (A70f) and I have the video card connected via S-Video to
my television as the second monitor. This issue isn't that important, but I
see it as a possible bug in Windows XP's dualview technology.