Windows Server 2003 family
_WIN32_WINNT>=0x0502
Windows XP
_WIN32_WINNT>=0x0501
Windows 2000
_WIN32_WINNT>=0x0500
Windows NT 4.0
_WIN32_WINNT>=0x0400
Windows Me
_WIN32_WINDOWS=0x0490
Windows 98
_WIN32_WINDOWS>=0x0410
Internet Explorer 6.0
_WIN32_IE>=0x0600
Internet Explorer 5.01, 5.5
_WIN32_IE>=0x0501
Internet Explorer 5.0, 5.0a, 5.0b
_WIN32_IE>=0x0500
Internet Explorer 4.01
_WIN32_IE>=0x0401
Internet Explorer 4.0
_WIN32_IE>=0x0400
Internet Explorer 3.0, 3.01, 3.02
_WIN32_IE>=0x0300
_WIN32_WINNT>=0x0502
Windows XP
_WIN32_WINNT>=0x0501
Windows 2000
_WIN32_WINNT>=0x0500
Windows NT 4.0
_WIN32_WINNT>=0x0400
Windows Me
_WIN32_WINDOWS=0x0490
Windows 98
_WIN32_WINDOWS>=0x0410
Internet Explorer 6.0
_WIN32_IE>=0x0600
Internet Explorer 5.01, 5.5
_WIN32_IE>=0x0501
Internet Explorer 5.0, 5.0a, 5.0b
_WIN32_IE>=0x0500
Internet Explorer 4.01
_WIN32_IE>=0x0401
Internet Explorer 4.0
_WIN32_IE>=0x0400
Internet Explorer 3.0, 3.01, 3.02
_WIN32_IE>=0x0300