Found out why it doesn't work. On the itch.io app, if a file doesn't have a little symbol next to it, like the windows logo, it means it's not labeled properly, and the itch.io application doesn't know how to run it. Presumably, this is why I was able to play before, on the web version of itch.io, but not the itch.io application. If the pc file doesn't work for you, try the web version of itch.io.