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From <a href="http://www.dummies.com/how-to/content/use-camera-raw-files-with-photoshop-cs5.html" rel="ugc"><b>Use Camera Raw Files with Photoshop CS5</b></a>:
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If Adobe Photoshop CS5 doesn’t open your Raw file, you may need to update the <b>Raw plug-in</b>. The plug-in should be downloaded and placed in this location in Windows: C:\Program Files\Common Files\Adobe\Plug-Ins\CS5\F<wbr />ile Formats, and this location on the Macintosh: Library\Application Support\Adobe\Plug-Ins\CS5<wbr />\File Formats
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From Use Camera Raw Files with Photoshop CS5 [http://www.dummies.com/how-to/content/use-camera-raw-files-with-photoshop-cs5.html]:

> If Adobe Photoshop CS5 doesn’t open your Raw file, you may need to update the Raw plug-in. The plug-in should be downloaded and placed in this location in Windows: C:\Program Files\Common Files\Adobe\Plug-Ins\CS5\File Formats, and this location on the Macintosh: Library\Application Support\Adobe\Plug-Ins\CS5\File Formats

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Hi bclausen73, how did this work out for you?
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Hi bclausen73, how did this work out for you?

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I am renting a Nikon D3s and just downloaded the files to my laptop for the first time. <br />
<br />
I can't open the RAW files in ACR and understand that I might need to download an app from Adobe to help with this. Can anyone help explain the steps?<br />
<br />
My current setup is a Nikon D700 and I use Photoshop CS5.
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I am renting a Nikon D3s and just downloaded the files to my laptop for the first time. 

I can't open the RAW files in ACR and understand that I might need to download an app from Adobe to help with this. Can anyone help explain the steps?

My current setup is a Nikon D700 and I use Photoshop CS5.

Nikon D3s RAW file download process

Photo and imaging software is used to edit and compose raster images; Adobe Photoshop dominates the market. Common actions include cropping, slicing, retouching, color replacement, masking and erasing. Other programs include GIMP, Serif PhotoPlus, Pixlr, PhotoScape, Picasa and IrfanView.

Photos / Graphics Software

Photo and imaging software is used to edit and compose raster images; Adobe Photoshop, which dominates the market, has its own topic. Common actions include cropping, slicing, retouching, color replacement, masking and erasing. Other programs include Apple Photo, Corel PaintShop Pro, GIMP, Serif PhotoPlus, Pixlr, PhotoScape, Picasa and IrfanView.

Images and Photos

Adobe Creative Suite (CS) is a software suite of graphic design, video editing, and web development applications developed by Adobe Systems. Each edition consists several Adobe applications, including Photoshop, Acrobat, InDesign, Premiere Pro or After Effects. Photoshop, InDesign, and Illustrator are the industry standard applications for many graphic design positions. CS6 is the last version of the Creative Suite; future versions of their creative software would only be available via their Adobe Creative Cloud subscription service.