How do you use vector files in Photoshop CS?

I have some ai vector files that I would like to use, but when I open them in photoshop, they simply appear raster-like and cannot be resized without jeopardizing the quality (they become pixelated). Does photoshop even support the usage of vector images? If so, how do use them?|||To add to answers given above, starting with the CS2 package Adobe synced Photoshop and Illustrator nicely. If you have both, you can import vector layers into Photoshop as "vector smart objects." By double clicking on them in the layer palette it will open them in Illustrator, and any saved changes will take their effect in Photoshop when you return to the program. Not quite the same, but in two totally different graphic worlds (vector and bitmap) its the closest you're going to get to joining them for now.|||Photoshop can import vector-based files, but it is not a vector program, it is a raster program. You'll want Adobe Illustrator. Photoshop will (should) allow you to choose size on import, and will retain the quality of the image if its a true vector image, but other than that it's going to end up in a raster format.|||You can open an ai file in Photoshop however it will always open as a raster,unless you opened it as a Smart Object, by double clicking on it, it will open in Illustrator where you can amend it. I find the best method is to cut and paste from Illustrator into a Photoshop (which you have already sized) as a Smart Object or as a path and use the path to recreate blocks of colour.