Files with pnagent file extension could be found in older Citrix Presentation Server as one of the configuration files.
PNAGENT file extension - Citrix Presentation Server data
What is pnagent file? How to open pnagent files?
File type specification:
The pnagent file extension seems to have been in the past used in Citrix Presentation Server for one of its file. Perhaps similar in purpose to ICA file type. Probably old, as the product is no longer sold.
This pnagent file type entry was marked as obsolete and no longer supported file format.
This type of file is no longer actively used and is most likely obsolete. This is typically the case for system files in old operating systems, file types from long discontinued software, or previous versions of certain file types (like documents, projects etc.) that were replaced in higher versions of their original programs.