System.Diagnostics.FileVersionInfo.FileVersionInfo C# (CSharp) Method

        private unsafe FileVersionInfo(string fileName)
        {
            _fileName = fileName;

            uint handle;  // This variable is not used, but we need an out variable.
            uint infoSize = Interop.Version.GetFileVersionInfoSizeEx(
                (uint)Interop.Version.FileVersionInfoType.FILE_VER_GET_LOCALISED, _fileName, out handle);

            if (infoSize != 0)
            {
                byte[] mem = new byte[infoSize];
                fixed (byte* memPtr = mem)
                {
                    IntPtr memIntPtr = new IntPtr((void*)memPtr);
                    if (Interop.Version.GetFileVersionInfoEx(
                            (uint)Interop.Version.FileVersionInfoType.FILE_VER_GET_LOCALISED | (uint)Interop.Version.FileVersionInfoType.FILE_VER_GET_NEUTRAL,
                            _fileName,
                            0U,
                            infoSize,
                            memIntPtr))
                    {
                        uint langid = GetVarEntry(memIntPtr);
                        if (!GetVersionInfoForCodePage(memIntPtr, ConvertTo8DigitHex(langid)))
                        {
                            // Some DLLs might not contain correct codepage information. In these cases we will fail during lookup.
                            // Explorer will take a few shots in dark by trying several specific lang-codepages
                            // (Explorer also randomly guesses 041D04B0=Swedish+CP_UNICODE and 040704B0=German+CP_UNICODE sometimes).
                            // We will try to simulate similar behavior here.
                            foreach (uint id in s_fallbackLanguageCodePages)
                            {
                                if (id != langid)
                                {
                                    if (GetVersionInfoForCodePage(memIntPtr, ConvertTo8DigitHex(id)))
                                    {
                                        break;
                                    }
                                }
                            }
                        }
                    }
                }
            }
        }