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Application Content Type Missing

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With some update of Firefox, it changed the way it handled Excel files to where it opened in Excel automatically instead of asking to open or save. I know how to change this in the Settings|Application, but I have a few users that Excel is not listed in the Content Type at all. Does anyone know how to add an application type if it's missing?

Thanks

With some update of Firefox, it changed the way it handled Excel files to where it opened in Excel automatically instead of asking to open or save. I know how to change this in the Settings|Application, but I have a few users that Excel is not listed in the Content Type at all. Does anyone know how to add an application type if it's missing? Thanks

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