|I'm assuming that the sheets opened in WP x3 previously on XP.. Make sure you install all the latest service packs. |
Have you tried opening the file from within Quattro? Unfortunately I beleive X5 and later is supported for Windows 7, so you probably wont get far with Corel.
Also, in case you need to associate your quattro files with WP X3: http://www.sevenforums.com/tutorial...