Have a look at these two SAS support site http://support.sas.com/ DOC references, regarding the two INFORMATs you mentioned; packed-decimal and zone-decimal are quite different, maybe your info source is incorrect? You didn't mention the exact SAS behavior or symptom when attempting to read the data file -- it would be useful to provide some hex-value strings in your post for feedback.
Also, I found the first link reference by doing a Google advanced search against the SAS.COM site, using the search argument below: