Fixed bug #675 Description From maf6@cornell.edu 2009-01-10 14:07:52 (-) [reply] Assuming the SDL project doesn't just want to pick these up from dinput8.lib or whatever instead, the definitions in SDL_dx5video.c should be: const DIDATAFORMAT c_dfDIKeyboard = { sizeof(DIDATAFORMAT), sizeof(DIOBJECTDATAFORMAT), 0x00000002, 256, 256, KBD_fmt }; const DIDATAFORMAT c_dfDIMouse = { sizeof(DIDATAFORMAT), sizeof(DIOBJECTDATAFORMAT), 0x00000002, 16, 7, PTR_fmt }; const DIDATAFORMAT c_dfDIJoystick = { sizeof(DIDATAFORMAT), sizeof(DIOBJECTDATAFORMAT), 0x00000001, 80, 44, JOY_fmt }; This way the call to IDirectInputDevice2_SetDataFormat in SDL_dx5events.c will succeed on x64.