|Getting Started with GNU/Linux|
|Prev||Appendix A. Advanced: Customizing file associations with ~/.mailcap||Next|
There is a system-wide mailcap file in /etc/mailcap. Your local settings override the settings found there, but it can be a good source of rule ideas. It also shows you what the default behavior of your system is.
There are files that associate filename extensions with mime-types. The system-wide file is /etc/mime.types and you may create your own in ~/.mime.types.