If you use Exposure as a Photoshop or Lightroom plug-in, then you don't need to worry about RAW file support. For plug-ins, Photoshop and Lightroom do all the RAW file reading.
As a stand-alone application, Exposure can read RAW files and edit them non-destructively. Here are links to RAW file formats supported in each version.
If your camera is on the list, but files read unsupported refer to this article.