In ntpebteb.h, the field "BOOLEAN UnalignedLoadStoreExceptions" in the definition of the TEB structure appears as applicable to both, the 32bit and 64bit TEB.
I believe that field applies only to the 64bit definition.
see Geoff Chappell's definition of the TEB at https://www.geoffchappell.com/studies/w ... /index.htm
Comments welcome.