Actually I believe they're stored like:
logs\Network\testnick.log
And if you have date enabled in filenames it would look like:
logs\Network\testnick.20050831.log
On *:Open:?:*: {
var %x = $findfile($mircdir,*.log,0)
while (%x) {
if ($+(*,$nick,*) iswm $+(",$findfile($mircdir,*.log,%x),")) loadbuf $nick $v2
dec %x
}
}
Maybe something like that to check if $nick has a conversation with you previously then load it.
*shrugs* just an example/idea.
-Andy