If AutoCAD was open during this process, close the application completely and relaunch it. This forces the software to re-scan its font libraries and register the new addition. Open your drawing, and the Arabic text should now display perfectly. Alternative Method: Using the Demand Load Path
Do NOT download files from suspicious "free font" websites claiming to have xarabshx.shx – they often contain malware. Instead: xarabshx autocad font