Re: Why do I get this message when I try to open a RAW file (from my Canon 5D Mk II): "Could not complete your request because Photoshop does not recognize this type of file." ??

In photoshop cs4 you can go to

Windows:

Help>About Plug-In and click on the words Camera Raw

Mac

Photoshop>About Plug-In and click on the words Camera Raw

Anyway, you can get the camera raw 5.7 update from here:

(your installed camera raw is probably a version lower than 5.2)

windows:

Adobe - Adobe Camera Raw and DNG Converter : For Windows : Camera Raw 5.7 update

mac:

Adobe - Adobe Camera Raw and DNG Converter : For Macintosh : Camera Raw 5.7 update