| Problem | Solution | |---------|----------| | Text displays as ??? or boxes | Font missing from font path – reinstall file | | Vietnamese characters missing | Ensure Vnsimli.shx is active, not substituted | | Slow text rendering | SHX fonts are fast – check if a TTF font is being used instead |

SHX fonts are composed of geometric lines and arcs, making them lighter on system resources than TrueType Fonts (TTF).

If you are a civil engineer, architect, or CAD designer working with Vietnamese text, you have likely encountered the dreaded "? ? ?" or garbled characters when opening a drawing file. The culprit is almost always a missing SHX font file. Among the most critical—and hardest to find—is .

How to install a new or custom font for use in AutoCAD products - Autodesk