Converting Smart Suite files 2 Office XP

I recently purchased a new computer that came with the Small Business Edition of Office XP on it. I need to convert several Lotus Smart Suite files with a .123 extension to Excel. I know the older versions of Lotus saved with a .wk* extension, but the default file extension is .123 for Smart Suite 97. I have several critical files saved in this format. None of the converter packs available from Microsoft address the .123 extentions. I would be most appreciative of any assistance.