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 | 
by Smoking Cloud

You can get it from OFPEC addons

http://www.ofpeditingcenter.com/addon_depot/view_type.asp?type=1