"a golfer will strike a ball w/ backspin [into a direct headwind] and the ball will travel further.."
Results will vary depending on the direction of the headwind, natch, but now you may ask, "Is the magnus force built into WGT programming?"
Good question because many people may experience different results, usually expecting a ball w/ BS to be hindered by a direct headwind when IRL a ball may sometimes be lifted up, like a wing, and travel farther than calculated. It depends on equipment and conditions.
Possible incidents:
"Instead of just making the green I fly over the back of the green and into the bunker. The shot carries 222yds, then stops dead in the sand. Surely this is a bug?! If I had an 18mile wind in my favour then maybe that could happen, but for it to fly that far into a head wind makes no sense."
http://www.wgt.com/forums/t/21473.aspx
other possible examples:
http://www.wgt.com/forums/t/365432.aspx
http://www.wgt.com/forums/t/347535.aspx
http://www.wgt.com/forums/t/180202.aspx
http://www.wgt.com/forums/t/55697.aspx