To: STH77
WMP does support Qualcomm's video accelerator but doesn't have lots of codecs.
(I hope next Core Player will work with Qualcomm in full )
WMP will play 800x480 using accelerator... what about format, I'd recommend mp4.
Try to use one of 640x480 presets under MP4 bookmark.
P.S. Core will play 320x240 videos. ( if you need 320x240
)