It is automatically created when a DGN (MicroStation) file is exported to a DWG (AutoCAD) format.
Understanding the DGNLSTYLE.SHX Font: Usage, Issues, and Missing File Solutions Download Font Dgnlstyle Shx
A version of the file found online may not contain the exact symbols your drawing needs, leading to broken or incorrect line displays. It is automatically created when a DGN (MicroStation)
Move the file to the default fonts directory, typically found at: C:\Program Files\Autodesk\AutoCAD 20xx\Fonts . Custom Support Path: Type OPTIONS in the command line. Go to the Files tab and expand Support File Search Path . Custom Support Path: Type OPTIONS in the command line
If you cannot obtain the original file and just want to stop the annoying popup, some users take a standard AutoCAD shape file (like ltypeshp.shx ) and to DGNLSTYLE.SHX . While this stops the error message, your custom line styles may still not display correctly as the symbols won't match. SHX vs. TTF: A Quick Comparison