Matt, I use GraphicConverter by Lemke Software. It can decompress anything I have run into, and can convert a large number of formats. Sorry, I am not personally familiar with .art formatted files, so don't know if it can handle them specifically. I use a Mac version of the software, but I believe the .exe version is also available. The intro screen of the software lists a website at www.lemkesoft.de and www.lemkesoft.pingnet.de Regards, Paul M.