How to beautify binary dict files?
If you have plutil installed

You can run this Applescript which will create a text version of the dictionary for you to read.

   property copyScriptPath : "~/Documents/" (* path dir for text version*)

tell application "Finder"
    set selectFiles to (get selection) (* get the finder selection*)
end tell
repeat with i from 1 to number of items in selectFiles
    (* convert to POSIX path*)
    set this_item to quoted form of POSIX path of (item i of selectFiles as alias)


    (* get the file name , add it to an alias, then use plutil to read and write atext version out using the original name*)
    do shell script "name=`basename " &amp; this_item &amp; "`;/usr/bin/plutil -convert xml1  " &amp; this_item &amp; " -o  " &amp; copyScriptPath &amp; "\"$name\".txt"
end repeat




OR

There is an old hint on macosxhints - 10.4: Edit binary (and normal) plist files with vim  

The post also has the link to the vim script that does all this.

Which may do what you want. ( don't use vim myself )

Quote from the post ( But please go and read it as there are comments and notes that you will need:


  What does it do? It reads a plist file, checks and memorizes if it is
  binary, converts it to plain text if necessary and turns on syntax
  highlinghting for XML. When you save the file again, it is converted
  to binary again for writing if it was binary in the beginning. If the
  file was not binary or if the conversion to binary fails (which can
  happen if you have syntax errors in your file), the file is stored in
  text format. If an originally-binary plist is saved as plain text due
  to syntax errors and you fix the errors and save the file again, it is
  written in binary format. If you open a binary file and just view it
  without making any changes, you can still exit from vim using the
  normal :q (no need for :q!) and the file is left untouched (still in
  binary format). All this should work even when working with several
  buffers (files), when reading a file into an existing buffer, or when
  only writing parts of a buffer to file