.net – How to tell whether I am on x64 or x86 using .NET

If I understand you correctly, you want to do a copy of one file if you're installing on x86 and different file (with the same name) if you're installing on a x64 platform.

First of all, you cannot create one MSI for 2 different platforms, since a x64 MSI simply will not run on a x86 platform and a x86 MSI will be installed using WOW64 on a x64 platform.

On the other hand, you CAN create one x86 MSI that contains 2 different versions of a file and selectively copy the appropiate file during installation.

The easiest way is using WIX (V3) instead of the build-in VS2008 MSI generator. WIX gives you far greater control over what gets installed on the customer's machine and where, the ability to generate different installers for different platforms and full MSBuild support as an added bonus. (see http://wix.sourceforge.net for more info.)

In case if you're wondering that WIX is still in Beta, the generated MSI files are perfectly OK and I never ran into a bug yet. (And I develop setup projects for a living.)

Finally, you can check with the VersionNT64 property if an x86 installer is running on a x64 platform. If that property is present, you're running x64, otherwise you're running on a x86.

Hope this helps.

For you to output foo {1, 2, 3} you have to do something like:

string t = "1, 2, 3";
string v = String.Format(" foo {{{0}}}", t);

To output a { you use {{ and to output a } you use }}.

Or now, you can also use C# string interpolation like this (a feature available in C# 6.0)

Escaping brackets: String interpolation $(""). It is new feature in C# 6.0.

var inVal = "1, 2, 3";
var outVal = $" foo {{{inVal}}}";
// The output will be:  foo {1, 2, 3}