As you can see on the official web page, QuickTime Player supports only MOV, MP4, M4V, MPEG-2, MPEG-1, 3GPP, 3GPP2, AVCHD, AVI and DV video formats. If Screen Recorder-Pro output file has other format, you will need to convert it using a utility from Mac Informer database. Also, I recommend you to upgrade QuickTime Player to the latest version.