How to open raw file (.CR2 file) in photoshop CS4?

I want to open raw files or .CR2 files in my photoshop CS4 but a notice box appears says "Could not complete your request because it is not the right kind of document". my photoshop is only a portable CS4, meaning it is not installed using its CD software (I only copied it thru flash disk) my camera... show more I want to open raw files or .CR2 files in my photoshop CS4 but a notice box appears says "Could not complete your request because it is not the right kind of document".

my photoshop is only a portable CS4, meaning it is not installed using its CD software (I only copied it thru flash disk)
my camera is canon 600d
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