Editing the header

Use the ‘Edit header’ item on the Special menu to show the edit header dialog box.
This show the header information contained in the dictionary. You will rarely need to alter these default settings. 

They are as follows:

Atom type
This is always ‘dict’ for a pronunciation dictionary.

Format version
Always ‘1’, apparently, for pronunciation dictionaries.

Script system
The script system under which the dictionary is intended to be used. For Roman script systems, this should be 0.

Language code
The language code under which the dictionary is intended to be used. For English language systems, this should be 0.

Region code
Ditto, for the region. For the US, this is is 0.

Last modified date
No guesses what this is.

You will also see the ‘Total byte length’ of the dictionary, which is measure of how much memory it takes when loaded.

You can also use Balloon Help to get more information on the various items.