Answer:
Based on a single instance, in October 2023, the following data was found in a text editor when the Siemens NX PCF file was opened:
Compare this to a valid PCF file (example here):
The only option is for the user to contact the technical support group of the application that generated the offending PCF file and work with them to generate a valid PCF file.
For manual and details on the PCF translator file structure and mappings, see wiki here: