Add support for X file format

[InfoLibre]

1. Specify the MIME type and extension for which to add support

application/rtf application/x-compress application/x-deb application/x-google-chrome-extension application/x-msdownload application/x-nintendo-nes-rom application/x-unix-archive audio/x-flac font/collection image/vnd.microsoft.icon image/x-canon-cr2

2. Share an example file These MIME type are listed on https://github.com/aofei/mimesniffer but not on https://github.com/gabriel-vasile/mimetype/blob/master/supported_mimes.md

Are they detected?