|Word can't open ClarisWorks files unless they've been saved as Word files first in the ClarisWorks application.|
You'll probably need to buy AppleWorks which Apple released to replace ClarisWorks. However, I just discovered that AppleWorks is no longer available either. They've replaced it with "iWorks":
I'm not saying that will definitley open CW files. You'll have to research that yourself or try and get hold a trial version before spending your money on it.