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“Mac OS X Plug-in” is a type of file which is used to provide hardware support to programs and applications in the Mac OS X. The extension used for this particular file is “.PLUGIN”.
If you want to read more on it check this :- http://www.softango.com/extensions/plugin
eAnswers Team
Mac OS X Keychain File is used by Apple’s Keychain application to store a user’s encrypted password and provides for automatic login to websites or network resources. Files can only be opened by the Apple Keychain application. Information is only stored in Keychain if users have selected the option in the operating system preferences.
To know more :- http://www.softango.com/extensions/keychain