Where is NODBC

i don't know if i'm doing something wrong...tell me if it is so...
BTW a client of ours needs to connect to his (native) navision 310 db from an outer program (i don't know which one, if it is important i'm going to ask him)...is it correct to use nodbc in order to connect to navision db?if so, where is this dll?
I couldn't find it on the installation cd...
edit: instead i found codbc...what is this?
edit2: ok found solution by myself...codbc is the nodbc for nav versions prior to 4...obviously I found codbc on 310 installation cd

and yes, codbc is the way to read native db data with outer applications