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...