|Since we can't see your system from where we're sitting, it would help if you told us what "i can't open that file" actually means. Do you get an error, does anything happen, etc.|
One thing to try is to see if the shortcut is still linked to the original file. Right click the shortcut, choose Properties and click the Find Target button.
If it takes you to the file, try to open the file itself. If it opens, delete the old shortcut and create a new one.
If it doesn't take you to the file, find the file "manually", try to open the file itself. If it opens, delete the old shortcut and create a new one.
If the file itself won't open, come on back and we'll see what else we can offer. If you do need more help, please make sure you tell us exactly what happens when you try to open the file and/or shortcut.