Phantomdaz,
the windows media player that came with the treo is for your camera.
when you record a video using the camera and sync your device it makes a copy in the PC and the file format for it is .3gp which the windows media player can play in the PC....
if you want to play video files that are in you SD card try using TCPMP... its a free media player that supports *.avi *.mkv *.mka *.mp4 *.m4a *.ogg *.ogm *.asf.......
http://corecodec.org/frs/download.ph...almos.0.66.zip
this can also play mp3's and wav files