you need the .exe file, as well as the folder next to it (should contain “Data” in the name). what i always do: create a directory called “builds” within your unity project dir (add it to .gitignore if you work with git), then create directories for each build output (e.g. one for mac and one for windows), and configure your build settings to build into these directories. in the end it should look like this: project/build/windows project/build/mac project/Assets/…
after that, simply create a zip file with all contents of the /build/windows directory, and upload that zip file.
you could do the same for the html5 build - it’s better if others don’t have to download anything, so more people will rate your game.