Not everything 32 bit runs on a 64-bit system. A vast majority of things do, but there are a number of unsafe operations that will break your game across architectures, and because games are closed source and the source code is often lost, it’s nearly impossible to get some games working on 64 bit architecture. That’s why Steam held out so long, some things are just going to break, and their only option is to basically delete them.
Not everything 32 bit runs on a 64-bit system. A vast majority of things do, but there are a number of unsafe operations that will break your game across architectures, and because games are closed source and the source code is often lost, it’s nearly impossible to get some games working on 64 bit architecture. That’s why Steam held out so long, some things are just going to break, and their only option is to basically delete them.