Because SHX lacks layout tables (like OpenType’s GPOS/GSUB), the tai font 3t-unicode.shx likely uses . This means every unique combination (e.g., consonant + vowel + tone mark ) is stored as a single, monolithic character. This is inefficient—a single word might require dozens of custom glyphs—but it works in AutoCAD.
: If a drawing uses this font and it is not installed on the system, AutoCAD will display a "Missing SHX files" warning and substitute it with a generic font like simplex.shx PDF Exporting tai font 3t-unicode.shx