2013 has a linetype called "proposed tile" and another one called "existing tile." 2012 doesn't have either. Is there any way I can could get those two files so I could load those two linetypes into 2012?
Out of Curiosity Are the simple linetypes, or complex linetypes?
You might be able to draw both linetypes into an empty drawing. use the "-EXPORTTOAUTOCAD" to save the file back to a 2010 format, then use design center "CTRL+2" to import the linetype from an open drawing.
If you would like more details on those steps, let me know.