I do not own pro/e. I hired a company to design a prototype for manufacturability. They used pro/e. I received the prt files via disk. The company went out of business. I hired another company to build the prototype. The need to translate the prt files to stl. They use solidworks (I think) and can not open all the files for some reason. I've tried downloading trial software ie Actify spinfire, as well as other software. I can not open the prt files to view or to translate. Is there anything anyone can suggest?