The Panorama Factory graphics software supports several graphics formats for output purposes. So it seems if you need to convert Panorama Factory projects (.pfp) and save them as PNG format, you have to use the program itself because it is highly unlikely any other program can handle .pfp projects.
Convert Panorama Factory project to Portable Network Graphic.
We have found 2 software records in our database eligible for .pfp to .png file format conversion.
Microsoft Windows software - convert pfp to png on Windows
A photo editor used to create panorama pictures
Convert from pfp file format
The tables with software actions are a good pointer for what a certain program does with various file types and often may give users a good hint how to perform certain file conversion, for example the above-mentioned pfp to png. However, it is not perfect and sometimes can show results which are not really usable because of how certain programs work with files and the possible conversion is thus actually not possible at all.
Apple macOS / Mac OS X software - convert pfp to png on OS X
A picture editing software for Mac