To prevent users from accessing some file types in otherwise permitted categories:
Steps
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Go to the page and click on a category filter name. Note that you can also edit category filters from within a policy.
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Select a category in the Categories list.
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Mark the Block file types check box under Advanced Filtering on the right-hand side of the page.
A list of file types is displayed.
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Use the check boxes to select one or more file types to block.
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If you want to block the select file types in all categories permitted by this category filter, click Apply to All Categories.
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Click OK, then Save and Deploy to implement your changes.