Picasa should be able to view and edit, save raw files but it isn't much in the way of an editor.
To use the files in photoshop, you can do 2 things:
1.) The older versions of photoshop don't support new cameras. Buy the latest version of photoshop to get the latest version of Camera Raw. You cannot install the new version of Camera Raw in older versions of the software
2.) Download the Adobe DNG converter free from the adobe website. Convert your camera specific raw files to Adobe's open DNG format and open them in almost any photo editing program, including older versions of photoshop.
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My Pentax Photo Gallery | My 500px | My Photo Blog | My Picasa Albums
K-5, K20D, Pentax DA 15mm f/4, Sigma 85mm f/1.4, SMC 50mm f/1.4, DA 18-55mm WR, Tamron 28-75mm f/2.8, SMC M 135mm f/3.5, Vivitar Auto-Extension Tubes, Metz 50 af-1, Yongnuo YN-560ii, Lumopro lp120, Cactus v4
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