What file format does LIBPF^® use to save flowsheets ?

LIBPF^® does not write any data to disk as individual files.

There is a relational database that stores all information and makes objects persistent. Depending on the underlying RBDMS (Relational Database Management System) this database can actually exist as a single file or as a collection of files.

For example the LIBPF^® 1.1 demos that you can download from the demos section use Microsoft Access on Windows, and Sqlite on Apple macOS.

On Windows the database file (*.MDB format) can be seen at the location: C:\ProgramData\Your Profile Name\Application Data\LIBPF 1.0.