You need a suitable software like AutoCAD to open a CTB file. Without proper software you will receive a Windows message “How do you want to open this file?” or “Windows cannot open this file” or a similar Mac/iPhone/Android alert. #AUTOCAD PLOT STYLE FILE LOCATIONS SOFTWARE# With this setting, the object retains its layer or individually set color. If you assign a plot style color, the color overrides the object’s color at plot time. You can specify one of 255 ACI colors, a true color, or a color book color.29 mar. #AUTOCAD PLOT STYLE FILE LOCATIONS SOFTWARE#.#AUTOCAD PLOT STYLE FILE LOCATIONS ZIP FILE#.