GTS

A simple recompile like you describe would be applicable a lot of
application programs, which are written in high level languages. Device
drivers are usually written in assembly language and there are significant
differences in CPU registers and operations in the 32 and 64 bit OS.

"Neil" <neil@chapellane69.free-online.co.uk> wrote in message
news:uWF61rpXHHA.1388@TK2MSFTNGP05.phx.gbl...
>I mean, once a hardware vendor has already gone to the trouble of making
>one for Vista x86. Not knowing anything about it at all, my naive thought
>is that once he'd done that, he would just compile it again but with the
>switch in the "this driver is going to run in a 64bit system" position
>rather than in the "this driver is going to run in a 32bit system"
>position.
>
> There must be more to it than that though, unless the vendors of some of
> my hardware are just being bloody-minded, because I have a couple of
> things which have 32bit drivers but not 64bit support.
>
> So why?
>
> Neil