RCDefaultApp is a preference pane that allows a user to set the default application used for various URL schemes, file extensions, file types, MIME types, and Uniform Type Identifiers (or UTIs; MacOS 10.4 only). MacOS X uses the extension and file type settings to choose the application when opening a file in Finder, while Safari and other applications use the URL and MIME type settings at other times for content not related to a file (such as an unknown URL protocol, or a media stream).

RCDefaultApp also allows setting the application when digital cameras or FireWire webcams such as iSight are connected to the computer. For completeness' sake, there are also settings that mimic the existing "CDs and DVDs" preference pane, which allows setting the action to take when various types of CDs and DVDs are inserted into the computer.

RCDefaultApp also allows entries to be disabled, such as URL schemes that have security issues.

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