What is a plist file and how do I open a plist file?
PLIST, or properties files are used by Mac OS X applications, formatted in XML and based on the Apple Core Foundation DTD. They contain properties and configuration settings for various programs. PLIST files can be saved in text or binary format. They should not be edited by a user, since they are modified by their respective programs as needed. Property list files included with applications can be created and edited by the developer using the Apple Property List Editor, which is included with Apple Developer Tools. They can also be opened and edited using a third-party PLIST editing program.
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How to open plist file on Wikipedia
How to open plist file on Microsoft.com