non-json content types

[cben]

Some files like openshift-origin-v3.8.0/swagger-2.0.0.pb-v1 are not JSON.
should they use other names than index.json to get appropriate content-type from GitHub Pages?

    367 content-type: application/json
      3 content-type: application/octet-stream
      1 content-type: application/x-gzip
      3 content-type: text/html; charset=utf-8
      5 content-type: text/plain
    105 content-type: text/plain; charset=utf-8
      2 content-type: text/plain; version=0.0.4