I believe King's Quest 6 is an SCI1, or SCI32 game, depending on if you're using the CD/high resolution version. SCI Studio 3 only supports SCI0 games. SCI Studio 4 will support all versions of SCI, including the cross platform versions such as Amiga and Macintosh. However, SCI Studio 4 has not yet been released. There are other tools which can open, display, and extract graphics from later SCI versions, but I don't know what they are, or where to get them.