pxp file structure for programming?

Are there any resources for the pxp file structure to allow programmers to create import/export functions in other programs so they will write to this structure? I have several projects I am working on in Objective-C and would like to be able to handle data I have in pxp files without first opening them in Igor and then exporting content as text or other more universal data types.
See "PTN003 Writing Packed Files" in "Igor Pro Folder/Technical Notes/Igor Pro Tech Notes".