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d3d:state_linepattern_w Setting line patterns is not supported in OpenGL core contexts

I keep getting this error for when I try loading up WingsXI which is a private server for WingsXI. I read that the fix is to force the game with the command wingsxi.exe-force-d3d9x-- but I have no idea where to input this inside of Playonlinux. Could someone help me? thank you!