Tai Font 3t-unicode.shx Here

Example (obsolete syntax – for documentation only):

\font\tai = "tai font 3t-unicode.shx" at 10pt
\tai สวัสดีชาวโลก

Or with a wrapper:

./"tai font 3t-unicode.shx" input.tex > output.dvi

Modern equivalent would be:

\usepackagefontspec
\setmainfontTai3T-Unicode[
  Extension=.ttf,
  UprightFont=*,
  BoldFont=*-Bold,
  ItalicFont=*-Italic
]

If you have the Unicode font installed but text still looks wrong:

Step 1: Locate the Original File

Step 2: Download from Reputable Sources

Step 3: Font Mapping (The AutoCAD Workaround) If you cannot find the exact file, you can map it to another SHX font using a .FMP (Font Mapping File). Create a text file: tai font 3t-unicode.shx

tai font 3t-unicode.shx;simplex.shx

Then run FONTALT in AutoCAD and set the system variable to use your map file. Warning: This will change glyphs; you will lose the correct Tai characters but recover text positioning.