WOW64: get x64 %CommonProgramFiles% from 32 bit process

Queries I tried: ExpandEnvironmentStrings("%COMMONPROGRAMFILES%"), GetSpecialPath(CSIDL_PROGRA开发者_如何学PythonM_FILES_COMMON).

All resolve to (typically) c:\\Program Files (x86)\\Common Files from my 32-bit app. I need to check a file version installed (typically) under c:\\Program Files\\Common Files of a 64-bit application.

On 64-bit operating systems, the ProgramW6432 environment variable points to c:\program files. The full list for a 32-bit app on an English version of Windows:

• ProgramFiles => c:\program files (x86)
• ProgramFiles(x86) => c:\program files (x86)
• ProgramW6432 => c:\program files
• CommonProgramFiles => c:\program files (x86)\common files
• CommonProgramFiles(x86) => c:\program files (x86)\common files
• CommonProgramW6432 => c:\program files\common files

Just a reminder: that folder should not contain anything of interest to a 32-bit program. Technically. Beware of the file system redirector, it will redirect file requests from c:\program files to c:\program files (x86). You'd have to use Wow64DisableWow64FsRedirection() if you'd actually wanted to access files in that directory.

%CommonProgramW6432%

static string ProgramFilesx86()
        {
            if (8 == IntPtr.Size
                || (!String.IsNullOrEmpty(Environment.GetEnvironmentVariable("PROCESSOR_ARCHITEW6432"))))
            {
                return Environment.GetEnvironmentVariable("ProgramFiles(x86)");
            }

            return Environment.GetEnvironmentVariable("ProgramFiles");
        }

Is this what you're needing?