creo6 config.pro option documentation for: IGES_IN_DWG_LINE_FONT 
iges_in_dwg_line_font
yes
, no
*
Controls the import of user-defined line fonts. This configuration option is available as Import user line fonts
in the Import IGES
dialog box.
yes
- Gives default names to user-defined line styles that do not have names. The names are in the order IGES_1
, IGES_2
, and so on.
no
- Imports the user-defined line fonts as a solid line font.