Listed on the Datacad DNN Forum page, they list convertors, but the links are not there.
In older versions of Dcad, these were in the chr folder.
One would use CHR2SHP, then SHP2SHX.
https://www.datacad.com/ddn/fonts_ref.htmlCHR2SHPThis command-line utility for decompiling DataCAD CHR fonts to SHP format was originally distributed by Tim Hamlett of ArcDraft America around 1994.
SHP2CHR
This command-line utility for compiling SHP files to DataCAD CHR fonts is included with DataCAD in the \CHR or \Fonts folder.
SHP2SHXThis command-line utility for compiling SHP files to AutoCAD SHX fonts was originally distributed by Tim Hamlett of ArcDraft America around 1994.
SHX2SHP
This command-line utility for decompiling AutoCAD SHX fonts to SHP format is a public domain product of Schreiber Instruments Inc. Version 4.0 was published in 1995.