Fallout 4 Ppf.esm -

When these break, the community tool or the repair feature within Place Everywhere can generate a Ppf.esm . This file stores repaired Previs and precombined data for your specific load order.

In simple terms: . It is not a standalone mod but rather an output file generated by a specific, powerful tool used by mod authors: Previsibines Repair Pack (PRP) . Fallout 4 Ppf.esm