On x64 versions of Windows, the default installation directory was « C:\Program Files (x86)\ ». Our installer does not install x86 or x64 binaries, but source code. So C:\Program Files\ seems the best choice on all Windows version.
On x64 versions of Windows, the default installation directory was « C:\Program Files (x86)\ ». Our installer does not install x86 or x64 binaries, but source code. So C:\Program Files\ seems the best choice on all Windows version.