In Scmdraft, under "upgrades", "terran", there is an upgrade called "burst lasers." What does that upgrade do?

I believe it extends the range of the wraith, but I don't know...I'll have to check that out

Take a look at the back of the SC case. Wraiths using missiles to attack an archon. From the guide included with the game, it says you can upgrade the wraiths with burst lasers to allow them to attack ground. Presumably it was removed so wraiths wouldn't suck so much.

It's an unused upgrade. Does nothing.