Firstable hello to all the forum.I am fighting to create a red light on the top of an hangar just a red bulb.I made in gmax a little cube 10 Cm named Light_nav or beacon assign material light_nav or beaconwith a diffuse red color .I know I have to tweek the .asm file so I change it, but nothing light up in fs.Did you know where I make wrong?I know I have to comment-out the asm and also 0.asm like tweeking for land light but maybe I am totally wrong.I work with 2004 sdk and FS9.Thank's for suggestion..asm;db 'D','I','C','T' ;param_extension_dictionary label dword ; dd 28; dict_0_g_lightStates equ 152; dd 2,152,4, 057F0E99Dh, 04E9C0523h, 0BB12B6BCh, 0063FE72Fh;param_extension_dictionary_end label dword ;bounding_box_riff_start label word; db 'B','B','O','X' ; dd bounding_box_riff_end - $ - 4; real4 -73.248, 0.000, -58.619 ; real4 73.248, 40.083, 58.694 ;bounding_box_riff_end label word 0.asm; IFMSK nolgt_1, dict_0_g_lightStates, LIGHT_NAV_MASK BGL_LIGHT LIGHT_NAV, -62.631, 40.083, 58.637, 20, 0.60, 0.40, 0FFFF0000h, 0.000000, 0.000000, 1.000000 ; source poly num = 2682; nolgt_1 label BGLCODE; IFMSK nolgt_2, dict_0_g_lightStates, LIGHT_NAV_MASK BGL_LIGHT LIGHT_NAV, 62.600, 40.083, 58.694, 20, 0.60, 0.40, 0FFFF0000h, 0.000000, 0.000000, 1.000000 ; source poly num = 2683; nolgt_2 label BGLCODE BGL_RETURN

What you have done looks correct, but only I would not comment out the BBOX section, better put that one back in.