Here's a problem that I just ran into setting a linetype by layer. In R14 and prior, you used the AEC Draw command to insert a block along a line to create the symbol for sanitary sewers, water lines, gas lines, etc. With the advent of Acad2000+ and Windows XP that routine has gone to the retired list. Autocad did not provide replacement linetypes, so new linetypes were created using the Express Tools routine. Works great. You set the new line types to the correct layers.Now you send your drawing to the client. He opens the drawing and all is well with the world. He inserts your drawing into his drawing and all of the linetypes disappear. His layers are all set to "continuous" linetype. He's too stupid to list the line to see what layer the lines are on. He's too dim witted to load a copy of your acad.lin file. My work-around is to set the line type on the individual lines. Wastes much less time than trying to deal with the retards. If they want to change the lines to their linetype, it's a one step operation, otherwise my symbols remain.