: Using a 32-bit Java version with 64-bit Surpac (or vice-versa) can prevent the DLL from loading correctly. How to Fix the Error
set JAVA_HOME=C:\Program Files\Java\jre1.8.0_311 set PATH=%JAVA_HOME%\bin\server;%PATH% start "" "C:\Program Files\Dassault Systemes\Surpac\2021\bin\surpac.exe"