|OK, I've just worked out a way to make it easier for you to create an association with xlr files (without having to locate your own file). I'm assuming, from what you've said, that the issue is a bad file association.|
Open NotePad and type in anything you like - "test" will do. Select "Save As" and save it as "test.xlr" (without the quotes). Look to see where it is putting it (probably in Documents). Go to Documents, or wherever, and find the file test.xlr.
Right click the file and choose "Open With", then move down to "Choose Default Program". If "Microsoft Works Spreadsheet" is listed then choose that (making sure the box "always open with..." is ticked) and OK your way out. If "Microsoft Works Spreadsheet" is not listed then click the browse button. You should already be in Program Files so move down to Microsoft Works, then wksss.exe (opening each folder as you go, by double clicking) then left click the wksss.exe file.
Click the Open button then OK your way out. Your test file should now open as a Works spreadsheet and with any luck your own file will now open properly too.
You would have had to do all this if you found your own file, so this method saves you having to search for it.
Please come back and let us know the outcome.