Although Corel PaintShop Pro can somehow generate or create .pcf files, it is not clear whenever this is done as export from some pictures (such as .png), or exported as some kind of settings. Give the fact these files are presets, conversions seems unlikely.
Convert Portable Network Graphic to Corel PaintShop Photo Pro colored foil preset file.
We have found one software suitable in our database for this conversion.
Microsoft Windows software - convert png to pcf on Windows
A professional photo editor and manager for Windows
Convert from png file format
The table with program actions contains information about what each program is capable of doing with their files. This may be a good pointer for further searches for certain file conversions and help you find the converter you are looking for if our search result is insufficient for you. However, it is far from perfect and may sometimes show results which are not really usable because of the nature of the software handles the files. So a conversion that appears as possible, just because of matched actions, may in fact not be possible.