The old version of the viewer timed out, so I've just rebuilt and uploaded a Version 1.0. This won't time out any more.
I didn't get time to make many changes, but I have added in PDF viewer support. When you extract the new .EXE, make sure that you also extract the "gs" folder. If the application finds this folder, it'll automatically add in the option to view PDFs.
Here's the download link...