I currently have several Lotus 1-2-3 documents which have been saved as release 9. I'm working with another user who has an earlier version of Lotus 1-2-3 (Release 5). I have saved the files as .WK4 so they can be opened using the earlier release, though when he attempts to open the documents he gets 'UNABLE TO OPEN FILE'. Notes suggests that the file doesn't exist or the disk is corrupted although it can be opened on the later version. It's not the PC as I've tried this on several others. It's not the diskette. I think it's the way I'm saving the file. Can anyone help?