I have solved the problem.
Apparently you need the _32bit_ OpenSSL package for mIRC, even on Win7 64bit.
Khaled, my guess is that you cannot use 64bit DLLs from a 32bit EXE. Any chance for a 64bit compiled mIRC later on?
(note: Visual C++ 2008 Redistributables x64 package works good with OpenSSL 32bit it seems. Don't install 32bit VC++2008 redistr if you have a 64bit OS.)
(same goes for Total Commander by the way, it's also a 32-bit app using OpenSSL DLLs)
Last edited by mrsk8r; 22/11/10 04:50 PM.