Preview a ZPL Label with a Network Printer not working

using this link below as a test of the ZPL code

How to Preview a ZPL Label with a Network Printer

Entered the following into the preview.

CT~~CD,~CC^~CT~

^XA~TA000~JSN^LT0^MNW^MTT^PON^PMN^LH0,0^JMA^PR4,4~SD15^JUS^LRN^CI0^XZ

^XA

^MMT

^PW812

^LL0812

^LS0

^FT22,40^A0N,28,28^FH\^FD$TEXT1$^FS

^BY2,3,62^FT21,119^BCN,,Y,N

^FD>:$TEXT2$^FS

^PQ1,0,1,Y

^XZ

the above was created with the ZebraDesigner software and saved to file.

when run, the preview shows a file name with .prn extension.

Why is the preview not working?

thank you.