As topic, how does mIRC use this file? Is it automatic while it's connecting? Is it for us to manually verify if the cert is valid?
If it's automatic and so important for a secure connection, shouldn't mIRC update it periodically? There is a new version here already: https://curl.haxx.se/docs/caextract.html
Tried to connect and authenticate via SASL without the file and this is what I get "19:43:44 * Unable to connect to server (SSL trusted authorities error)", I guess it's automatic then.
So, the previous question, shouldn't mIRC update that file regularly?