not true, the Korg Soundgate software plays raw DSD files. as for SACD, usually the files are 24-bit/96kHz .wav format. But they can be in FLAC. Another popular version is .iso/.nrg (disk image file.)
As for ripping straight from the SACD, the PS3 has yet another awesome hidden feature, it is an SACD player. In being an SACD player, you can rip SACD's to your computer via a PS3.... its a pretty handy gaming system