File Juicer
File Juicer for macOS
Overview of Formats

Search & Extract

Images

jpg jpeg 2000 gif png pdf wmf emf tiff eps pict bmp

Video

mov mpeg avi wmv

Sound

mp3 wav System 7 au aiff

Text

ascii rtf html

From:

avi cab cache chm dmg doc emlx exe ithmb m4p mht mp3 pdf pps ppt raw swf wps xls zip and other formats

plist - Property Lists

Property Lists are typically used for preferences, and can be on both text and binary form.
You can view and edit them with Apples "Property List Editor".
If you don't have it get Apples XCode Tools or alternatively one of the utilities like Plist Edit Pro.
More about plists on wikipedia