Many years ago I created for floor plans of my factory (on a Mac Plus!) I created these using Mac Draw and Claris works and stuff like that. I saved all the files and I now need to get into them and revamp the layout of our factory but I can't find any software that will open any of these old files. Some of them are labeled as Microsoft Word files but no Microsoft program will open them. Some are labeled as .PDF but they cannot be opened by illustrator. It says they were saved in an invalid format. Any ideas would be greatly appreciated!