I'm leaving the office, but saw your post before packing up. Forgive me if this is very terse - late to pick up my son.
1. Record a video on your camera.
2. Put your card in the card reader and look for where the file is located in the card using your windows explorer.
3. Copy the quicktime file in the same location.
Now, provided that the file you just copied can be supported by the camera, you should be able to play it back. I think the camera can only support 15 fps with sound and 30 fps without at a screen res. of 640x480.
Hope that helps.
EDIT - I had limited success with my Fuji P&S. Don't have a Pentax to test this, but I'm hoping it does work.