Para visualizar los RAW en Vista, de la misma manera que los jpg, tienes el codec disponible en la web del fabricante de la cámara.
En el caso de Nikon:
http://nikonimglib.com/nefcodec/Descarga directa:
http://chsv-soft.nikon-image.com/ww/software/win/S-NEFCDC-110WF-ALLIN.exeLas cámaras compatibles Nikon, son: D1, D1H, D1X, D100, D2H, D2Hs, D2X, D2Xs, D3, D200, D300, D40, D40x, D50, D70, D70s, D80, COOLPIX 8800, COOLPIX 8700, COOLPIX 8400, COOLPIX 5700, COOLPIX 5400, COOLPIX 5000
Para Canon:
http://www.usa.canon.com/opd/controller?act=OPDSupportVistaActEscoger: Cameras, EOS (SLR) Camera systems, Canon RAW Codec Software
Las cámaras compatibles Canon, son: EOS-1Ds Mark III, EOS-1Ds Mark II, EOS-1Ds, EOS-1D Mark III, EOS-1D Mark II N, EOS-1D Mark II, EOS-1D, EOS 5D, EOS 40D, EOS 30D, EOS 20Da, EOS 20D, EOS 10D, EOS D60, EOS D30, EOS Kiss Digital X / EOS DIGITAL REVEL XTi / EOS 400D DIGITAL, EOS Kiss Digital N / EOS DIGITAL REBEL XT / EOS 350D DIGITAL, EOS Kiss Digital / EOS DIGITAL REBEL / EOS 300 DIGITAL PowerShot Pro1, PowerShot Pro90 IS, PowerShot G9, PowerShot G6, PowerShot G5, PowerShot G3, PowerShot G2, PowerShot G1, PowerShot S70, PowerShot S60, PowerShot S50, PowerShot S45, PowerShot S40, PowerShot S30