If a device was not included in a file specification, DK: was assumed.
The file specification was introduced by Esri.
The file specifications will be documented, and users wishing to load their own files must convert them into the Okapi format.
Licensing issues that prevent companies from using competitor's file specifications.
The file specification carrying the data is the same but the data is not the same.
If there are many implementation guidelines used there will be in practice many different standards based on the same file specification, a situation very hard to deal with.
The binary file specification is, at most, going to save you a few minutes reverse engineering a remarkably complex system.
Learn more about file specifications for Savings Bond Value Files.
Several file specifications are available on the USPTO website.
Copying was generally permitted between any file specification to any other where it made sense.