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that isn't what I cautioned against
Fair point, and you're right that files should be avoided, as should ordinary saw blades. The right tool is a carbide coated abrasive blade. HSS tools will be blunt long before you've finished the cut, and then they will start tearing the composite apart rather than cutting it.
gbj_tester
Scilly.Suffolk
Not me.
I do have a low opinion of mistreating it though, which I'd say filing across the cut end is.
I dare say using a high-speed (relative to hand filing), smooth (relative to a file) abrasive around (not across) it is fine.
But that isn't what I cautioned against.