Files that has to be ignored and not served

Hello,
I have static files (.sass) that do not need to be served but ignored by the extensionToMimeTypeInfoEx function
Right now, it fails with "unknown extension type"
Do you have a plan for such issue already ?
Thanks for your reply.
Alexandre

Start by reading the extensionToMimeTypeInfoEx function and trace how an unknown .sass extension is handled. Confirm how files that should not be served are represented, then make sure those files are ignored without triggering the unknown extension error and verify the existing serving behavior remains intact.

Written by the indexing model from the issue text.