game publishing problem

hello, I'm having a problem on publishing my game

because I want the executable to run on both windows 32bit and 64bit but when I build the game and choose windows on the dropdown the build that it produces only runs on windows 32bit but not runs on windows 64bit

same things as windows 64bit build, it works on windows 64bit but not on windows 32bit

the problem here is I have noticed that some games published by users around the web both runs on 32bit and 64bit but mine runs only on one platform?

what is the solution for this problem thank you