http://blogs.msdn.com/billwert/archive/2008/02/24/tip-don-t-rely-on-environment-variables-for-critical-decisions.aspxI saw a mail this week asking how you can determine what bitness your process is running in, and one of the suggestions was to check for the PROCESSOR_ARCHITEW6432 environment variable. If that variable exists, you know you're on 64 bit Windows in a 32en-USCommunityServer 2.1 SP1 (Build: 61025.2)