PPD stands for PostScript Print Definition file.. I have not processed this type of a file so far in CMOD, and that's why, I looked it up from the internet. I am not clear what the data looks like.... AFP or XML like tagged text... or something else. A lot depends on the data and meta indexes for what you can and cannot do.
Question: Is the file going to be stored and retrieved as a single document?
If yes, you are probably out of luck and you will probably hit the 2 GB maximum document limit of CMOD.
If no, assuming that the file contains smaller units of data (documents) delimited by some tags or meta indexes that will allow you to easily index them, and you may be in luck. As long as none of the individually delimited documents in the file exceeds 2 GB, you should be OK. I have processed files larger than 15 GB successfully and because the documents in the file were less than 2 GB, CMOD processing went fine.