#include windows.h
#include"psapi.h"
#include"shlwapi.h"
#include"commctrl.h"


COLORREF clr = RGB(220,220,220);

BOOL CALLBACK wenum( HWND hwnd, LPARAM lParam)
{
   const UINT cb = 261;
   static wchar_t    name[] = L"SysTreeView32",
                     tmp[cb] = {0};
   if( ::GetClassNameW( hwnd, tmp, 260 ) && 0 == _wcsicmp( name, tmp ) )
   {
      ::SendMessageW( hwnd, TVM_SETBKCOLOR, 0, (LPARAM)clr );
   }

   return TRUE;
}

BOOL CALLBACK EnumTops(HWND hwnd, LPARAM lParam)
{
    DWORD             dwThreadId  = 0,
                     dwProcessId = 0;
    HINSTANCE         hInstance;
   static wchar_t derVS[]     = L"devenv.exe";
   wchar_t  name[_MAX_PATH]   = {0},
            *exe              = 0;

    HANDLE hProcess;
   if (!hwnd)  return TRUE;     // Not a window
   if (!::IsWindowVisible(hwnd)) return TRUE;       // Not visible

   if (!SendMessage(hwnd, WM_GETTEXT, sizeof(name), (LPARAM)name))
      return TRUE;      // No window title
   dwThreadId = GetWindowThreadProcessId(hwnd, &dwProcessId);
   hProcess = OpenProcess(PROCESS_ALL_ACCESS, FALSE, dwProcessId);
   if( !GetModuleFileNameEx(hProcess, 0, name, sizeof(name))) goto exit;

   exe = ::PathFindFileNameW( name );
   if( (void*)exe == (void*)name ) goto exit; // mhm? maybe not exit?

   if( _wcsicmp( derVS, exe ) ) goto exit;

   EnumChildWindows( hwnd, wenum, (LPARAM)hProcess );

exit:
   CloseHandle(hProcess);
   int res = GetLastError();
   return res;
}

int wmain(int argc, wchar_t * argv[])
{
   if( argc = 2 )
   {
      wchar_t *end = 0;
      long l = wcstol( argv[1], &end, 16 );
      clr = (DWORD)l;
   }
   ::EnumWindows(EnumTops, NULL);
   return 0;
}