Jim,
Try IZarc. It has worked on all files I've had to open. Here is the opening paragraph of their 'help' sheet:
If you ever used the Internet, you've probably encountered archive files like Zip, Rar, Arj etc. IZArc is the way to handle these archived files. It's both powerful and very fast. IZArc includes tight integration with My Computer and Windows Explorer. Drag and drop to or from Explorer, or zip and unzip without leaving Explorer.