In a world I am building, I have a race of Dragons. A lot about them is based around questions previously asked on this site; as a result, most of them are around human-sized and cannot fly (a pox on you, square cube law!). However, due to the fact that their evolutionary ancestors initially could fly due to magic (all of which was stolen by the Elves to kill the mountain-sized dragons of old), these dragons still have arms specifically designed for flight. This means that their back and pectoral muscles are incredibly over-developed, and their arms are almost twice as long proportionally as a human's (they also have two extra-long fingers on each hand, but I don't think they matter as much).
So my question is, what medieval-age weapons would these long-armed dragons use? Would there be existing weapons that would benefit from longer arms and strong wing-flapping muscles, or would they devise specially modified weapons which could take better advantage of these differences without suffering from as many downsides? Fights with humans and other dragons should be considered.
Some extra notes on dragons: they're sort of a cross between bipedal and quadripedal, putting most of their weight on their legs but using their hands for stabilization (and pretty much just because they reach down that far anyway). Due to their musculature and big heads, they're pretty topheavy, but have somewhat flexible tails as a counterweight. There are individuals (usually smaller, with longer arms) that have fully formed wings, but most have bred out the genes for webbed arms or simply cut off the webbing at an early age. Dragons are not magic-users, and on average are lower in intelligence than humans, though more intelligent than animals.
EDIT: On the strength of dragon arms: think of them like bats. Their arms are built more for flight than anything else. While they may use their arms to walk, they probably still can't do a pull-up, and bats are small enough for square-cube to work in their advantage. Now, dragons have evolved, so their arms will have some added definition, but due to their excessive length I'd say it's still not enough for a pull-up, and holding heavy things is probably going to be a bit of a challenge. However, like I said, they're built for flight, so any flying motions are going to be very powerful, but just like a bat wouldn't want to flap its wings directly into a wall, the dragon should be careful where he puts all that force.