Do the .tpl files need to be in a specific folder?
Yes. You need to copy the extracted TPL files you got from Mario Kart Arcade GP 2 to the folder where the
wimgt.exe executable is stored.
(Example: if you have extracted all the contents of the SZS tools in a folder called "SZStools" on Downloads, then the folder will be
Downloads/SZStools/bin)
What commands do I need to type into CMD to get what I want?
Open the CMD window on the folder the executable
wimgt.exe is. (For this, first open the folder where is stored the wimgt.exe executable file, then right click in any empty space in the folder and select "Open Command Window Here").
Or go to the address bar, write CMD and press Enter.
When the CMD windows appears, then write this command and press Enter:
wimgt.exe decode [TPL_input]
Example: wimgt.exe decode save_banner.tpl
Another example: wimgt.exe decode VCPic.tpl
Once this screen appear, you have made a PNG file from your TPL:
Unfortunately i don't find any video guide for doing this stuff, sorry.