How to convert from .fzp to .fzpz?

You can unzip any .fzpz to see and copy the prefix for the five files. This link may also help describe what the prefix is for;

Make sure the file names in the .fzp are the same as .svg files.

I use 7zip, click the “Add to Archive”, it should default at "Archive Format: zip… if not, change it to .zip. In the archive combo box at the top, rename the file extension from .zip to .fzpz and click OK. It is just a .zip file with the .fzpz extension…