shell32: SHGFI_EXETYPE flag should have the files returning 0 if they are DLL images.

dlls/shell32/shell32_main.c

@@ -275,6 +275,9 @@ static DWORD shgfi_get_exe_type(LPCWSTR szFullPath)
         SetFilePointer( hfile, mz_header.e_lfanew, NULL, SEEK_SET );
         ReadFile( hfile, &nt, sizeof(nt), &len, NULL );
         CloseHandle( hfile );
+        /* DLL files are not executable and should return 0 */
+        if (nt.FileHeader.Characteristics & IMAGE_FILE_DLL)
+            return 0;
         if (nt.OptionalHeader.Subsystem == IMAGE_SUBSYSTEM_WINDOWS_GUI)
         {
              return IMAGE_NT_SIGNATURE |