win32.hlp
http://www.winasm.net/win32hlp.html

opcodes.hlp
http://www.x-ways.net/winhex/kb/resources/Opcodes.hlp

ntundoc.hlp
http://undocumented.ntinternals.net/ntundoc.chm

sock2.hlp
http://winapi.freetechsecrets.com/sock2/