Today I downloaded D-ViewCam DCS-100 on my pc. I did a few test recordings but can't play them back. In the folder with the date I see a file each time I recorded, but they're all .dat files. When selecting the playback screen then DayTime Search Dialog, I see my camera (the only one configured) but it says 'No camera selected. So, pressing play does nothing. I tried various ways to select the camera, how do I do that?