Other options include:
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Sorting or grouping by extension (probably not what you want in this case).
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Sorting or grouping by File Type Group (e.g. Movies) or Kind (similar, but defined by Windows).
The second one can be done using this add-in:
When grouping, you can sort by other columns at the same time, or even sort by multiple columns, to change the order or things within each group.
If you want complete custom sorting or grouping (e.g. if you wanted to sort by extensions but not in alphabetical order), that's also possible using scripting.