inserting obj weapon skins help

[xescarface]

ok i have an a pistol skin downloaded in a .obj filetype right. i downloaded that program HMT v3.5. i looked up some tutorials for about 2 and a half hours now and all the tutorials for that program are weird. can anybody just tell me please if 1 that is the program i use to insert that file into my halo map. and 2 explain step by step how i insert the obj file into my halo map. it would be a really big help, i searched for guides but all of them dont help me they are either for vehicles or something else that doesnt make sense. thanks!

does anyone have any knowledge of this?

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