If the file is truly missing, the safest way to recover it is through the built-in repair tool rather than downloading random DLLs from the internet (which can often contain malware). Go to > Programs and Features . Find AutoCAD 2010 in the list. Click Uninstall/Change and then select Repair or Reinstall .
AutoCAD 2010 was one of the first versions to offer a dedicated 64-bit installer. Ensure you aren't trying to run the 32-bit version of the software on a 64-bit OS, as the adlmint.dll file is architecture-specific. If you are migrating to a new PC, always use the 64-bit installation media to ensure the libraries match your processor's instruction set. Adlmint.dll Autocad 2010 64 Bit
If you can tell me you're using or the exact error message text, I can give you a more specific fix. If the file is truly missing, the safest