> It should be available on all your Win32 platforms

WINMSD is only on WinNT or later machines, previously you have to look for MSD, which may or may not be there, so this is probably not a good route. I would suggest using GlobalMemoryStatus (as someone has already pointed out below). Some pages that might help:

• http://www.winehq.com/WineAPI/GlobalMemoryStatus.html
• http://msdn.microsoft.com/library/psdk/winbase/memman_090z.htm
• http://www.vb-world.net/api/tip112.html
• http://www.chami.com/tips/delphi/122496D.html

Warning: The M$ link has the best information, but is also the most likely to become a bad link as they rearrange their directory structure/file naming convention yet again. :)