how to detect 64bit platform by script

Question

If you want to throw a check on whether to drop or run a file you can also throw a check on the call.

Check: IsWin64;

or even

Check: "not IsWin64";

This allows a quick and easy way to compile 32-bit & 64-bit application installers into one package, but only run the specific one.

EDIT: To expand a little further for those that might be searching for this, I wanted to follow up.

For example, if you want to only allow certain files to be copied down by the installer you could do the following:

[Files]
Source: "MyProg-x64.exe"; DestDir: "{app}"; Check: IsWin64;
Source: "MyProg-x86.exe"; DestDir: "{app}"; Check: "not IsWin64";

Adapted from source: http://www.jrsoftware.org/ishelp/index.php?topic=scriptcheck