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How do I change the default word processor that Firefox opens my downloads in?

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I deleted the one that I originally set (Works Word Processor), and can not open any documents until I change this setting to Microsoft Word. I get an error message saying "[file name] could not be opened, because the associated helper application does not exist. Change the association in your preferences." Okay, but how?

I deleted the one that I originally set (Works Word Processor), and can not open any documents until I change this setting to Microsoft Word. I get an error message saying "[file name] could not be opened, because the associated helper application does not exist. Change the association in your preferences." Okay, but how?

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