itch.io

It's how you're supposed to open it. You're probably doing it wrong :/ 

First, there's that file that Beardere showed. Click on it once. At the top, you probably will see a thing saying 'Extract files'. Click on that. Then, after it's finished extracting, re-open file explorer. Double-click on the file this time. Then there's a file that say something like 'ddlc_game'. Double-click on that. And there you have it. The DDLC game.