Meaning of Txt2 section of PSD file

Hello,

I am trying to get some information about Type Tool from PSD file into my program. In Adobe Photoshop File Formats Specification (see Txt2) you only say, that there is a length of data + Raw bytes for text engine.

But it seems, that Microsoft somehow managed to parse these raw bytes - http://dotnetinside.com/en/type/Microsoft.Expression.Importers.Psd/LayerMaskInfo/5.0.30709.0

Is that part of specification private (secret), or it is available for Microsoft only, or is it public? If it is public, can you add it to specification?