x86 is the 32 bit version. If you pick the launcher without the instruction set at the end (bf4.exe) you'll get the 64 bit version. It's located in the same file path just a few files under the x86 launcher.
Depends on the game. Some games have an x86 and an x64 .exe. When you create the shortcut you will have to pick the launcher you want to use.
I mostly use battlefield 4 and the exe its assigned has x86 in it. is that because it launches in google chrome? I realize chrome is a 32bit browser, so all it takes is switch it to firefox perhaps?
x86 is the 32 bit version. If you pick the launcher without the instruction set at the end (bf4.exe) you'll get the 64 bit version. It's located in the same file path just a few files under the x86 launcher.