Directions for gunslingers editor add-on
http://www.ofpeditingcenter.com/download.shtml
Bottom of the page editor addons
you also need SMC BTMP Duo Pack | Version: 1.3 | ReleaseDate: 1/3/2002
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by Smoking Cloud
You can get it from OFPEC addons
http://www.ofpeditingcenter.com/addon_depot/view_type.asp?type=1