FMP is strictly 32-bit so it can only use the 32-bit plugins.
The 64-bit plugins exist for server-side plugins. FMS is 64-bit
I knew there was an easy answer since I could not find any discussion on it :-) Thanks!
If you need to know if FileMaker runs ina 64bit Windows, you can use our plugin function MBS( "SystemInfo.Is64bitWindows" ) to know that.
If you want to know which plugin to install, you can check our Plugin Decision Graph: