In an ideal world, everything runs as native bitness (64bit program on 64bit OS, 32bit program on 32bit OS) and life goes on. However, sometimes you need to run that legacy 32bit program on a 64bit OS and need to configure things a little differently as a result. How can you detect this WOW64 case (32bit program on 64bit OS) and act appropriately?

Detection Matrix The general idea is to check the following environment variables: • PROCESSOR_ARCHITECTURE - reports the native processor architecture EXCEPT for WOW64, where it reports x86. • PROCESSOR_ARCHITEW6432 - not used EXCEPT for WOW64, where it reports the original native processor architecture. Pavel – There are two reasons I chose to express bitness detection using environment variables: 1. Harry Potter 2 Full Movie In Hindi Download Mp4 on this page. Environment variable is pretty universal and natively available to Batch, Windows Script Host, ASP/ASP.Net/PHP, C/C++, etc.

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I want my code to have an easily accessible external knob to tweak. I like the environment variable approach precisely *because* the parent process can do this alteration. Ultimately, it comes down to who has control – the developer of the code or the administrator using the code. I prefer that the developer control all the defaults but allowing the knowledgeable administrator to tweak for extraordinary circumstances.

Your approach is comparable to my alternate way to test – IF PROCESSOR_ARCHITECTURE==x86 AND PROCESSOR_ARCHITEW6432 NOT DEFINED //David. Udi – I recommend against writing one installer that installs different bitness on the fly. It makes handling bitness more complicated than it needs to be.

Just make a 32bit x86 installer and a 64bit x64 installer. For example, if I launch your installer on a 64bit OS while under a WOW64 cmd-shell, should your installer install 32bit, 64bit, both, or neither? And what is the user intention in this scenario? This will remain the classic problem on 64bit OS for many years to come.

The answer is trivial with pure 32bit and pure 64bit installer. When you start adding logic, it can backfire.

Udi – I am pointing out the classic problems that people miss. You will have to provide your own answer because it depends on what you want to do. I am just saying that the problem exists only if you have one installer that tries to figure things out. If you have one 32bit and one 64bit installer, it is a non-issue. If you cannot come up with your own answer then you should stick with separate 32bit and 64bit installers. MSI-based installers easily detect bitness and do the right things, so trying to bake it all into one installer means you have to know what you are doing. I just think it is weird for a 32bit SYSWOW process to install 64bit code because it breaks compatibility.