File and "Open" will open the .pz3 file for you  :)

You can store your .pz3 files anywhere you want, even on an external hard drive.  Just simply using the browse feature in the "open" window to locate it.

Be prepared to wait while it opens though. Sometimes depending on how large the .pz3 file is it can take a few minutes to open.

"It is good to see ourselves as others see us. Try as we may, we are never
able to know ourselves fully as we are, especially the evil side of us.
This we can do only if we are not angry with our critics but will take in good
heart whatever they might have to say." - Ghandi