I had to reload Photoshop CS (Windows XP) and the file extensions no longer appear after the name in my Browser Thumbnails. I've tried everything I could think of, read everything I could find to read. No reference to extensions in thumbnails. You know, .psd, .png, .tif, etc. Lots of pictures of them already there, but no info on how to get them to appear. There's got to be a switch somewhere.