System.Data.SQLite

          if (processorArchitecture != null)
              return processorArchitecture;

          //
          // BUGBUG: Will this always be reliable?
          //
          return Environment.GetEnvironmentVariable(PROCESSOR_ARCHITECTURE);
          processorArchitecture = Environment.GetEnvironmentVariable(
              PROCESSOR_ARCHITECTURE);

          //
          // HACK: Check for an "impossible" situation.  If the pointer size
          //       is 32-bits, the processor architecture cannot be "AMD64".
          //       In that case, we are almost certainly hitting a bug in the
          //       operating system and/or Visual Studio that causes the
          //       PROCESSOR_ARCHITECTURE environment variable to contain the
          //       wrong value in some circumstances.  Please refer to ticket
          //       [9ac9862611] for further information.
          //
          if ((IntPtr.Size == sizeof(int)) &&
              String.Equals(processorArchitecture, "AMD64",
                  StringComparison.OrdinalIgnoreCase))
          {
#if !NET_COMPACT_20 && TRACE_PRELOAD
              //
              // NOTE: When tracing is enabled, save the originally detected
              //       processor architecture before changing it.
              //
              string savedProcessorArchitecture = processorArchitecture;
#endif

              //
              // NOTE: We know that operating systems that return "AMD64" as
              //       the processor architecture are actually a superset of
              //       the "x86" processor architecture; therefore, return
              //       "x86" when the pointer size is 32-bits.
              //
              processorArchitecture = "x86";

              //
              // NOTE: Show that we hit a fairly unusual situation (i.e. the
              //       "wrong" processor architecture was detected).
              //
#if !NET_COMPACT_20 && TRACE_PRELOAD
              Trace.WriteLine(String.Format(
                  CultureInfo.CurrentCulture,
                  "Detected {0}-bit pointer size with processor architecture " +
                  "\"{1}\", using processor architecture \"{2}\" instead...",
                  IntPtr.Size * 8 /* bits */, savedProcessorArchitecture,
                  processorArchitecture));
#endif
          }

          return processorArchitecture;
#else
          //
          // NOTE: On the .NET Compact Framework, attempt to use the native
          //       Win32 API function (via P/Invoke) that can provide us with
          //       the processor architecture.
          //
          try