WOW64: get x64 %CommonProgramFiles% from 32 bit process

StackOverflow https://stackoverflow.com/questions/2539724

  •  23-09-2019
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Question

Queries I tried: ExpandEnvironmentStrings("%COMMONPROGRAMFILES%"), GetSpecialPath(CSIDL_PROGRAM_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.

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Solution

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.

OTHER TIPS

%CommonProgramW6432%

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

            return Environment.GetEnvironmentVariable("ProgramFiles");
        }

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