Although not "official" by MS, perhaps the one from ANTLR's collection [0] is a good start (there are also other ANTLR VB6 grammars documented elsewhere). It do

Although not "official" by MS, perhaps the one from ANTLR's collection [0] is a good start (there are also other ANTLR VB6 grammars documented elsewhere). It does require knowing ANTLR's meta syntax, but it's not that far from (E)BNF. [0] https://github.com/antlr/grammars-v4/tree/master/vb6 https://github.com/antlr/grammars-v4/tree/master/vb6