That depends. Photoshop Elements 9 is compatible with Camera Raw up to version 6.5. So the files from any camera supported by that version of Camera Raw can be opened. Camera Raw 6.5 is quite old, and a lot of new cameras have been released since then. Newer versions of Camera Raw are required to open those images. But you can download the latest DNG converter and create digital negative copies of raw files from newer cameras. And those DNG files, which contain the raw image data, could be opened with what you have now.