You tried both from main menu to select deck builder or directly to open deck.exe and they both failed? It seems to me you are trying to open the deckeditor.exe
that we may have left in the main folder (I am not at home to check if this is the case) which is a relic of old times that doesn't work.
blacklotus1993 wrote: is there an app by chance that will let me view the premade decks? I would love to try to take a few of them and make a paper deck. I love the easyas123 deck
Any text editor can open the .dck files that are in playdeck folder. Install one for instance Notepad++, then you can right click on the file and select to open it with the text editor.