Files with the .plist extension contain property information about a variety of different Mac OS programs. These files are a part of the OS X Core Foundation. They are used by a number of OS X applications.
In some cases, files with the .plist extension will be called "preference" files. PLIST files can be saved in either ASCII, XML or Binary format. The older PLIST files are written in ASCII format and they are for older versions of the Mac operating system. The XML PLIST files are used for versions of the Mac OS that were distributed prior to Tiger. The PLIST files that are saved in binary format are used for the Tiger operating system.
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File.org aims to be the go-to resource for file type- and related software information. We spend countless hours researching various file formats and software that can open, convert, create or otherwise work with those files.
If you have additional information about the PLIST file format or software that uses files with the PLIST suffix, please do get in touch - we would love hearing from you.