ObjectARX 2026 SDK

[cturlington]

The above download did not appear to provide access to "Autodesk.Civil.DatabaseServices.dll," and "Autodesk.Civil.dll."  Are they still provided in the 2026 Civil 3D download? It does not appear that they are.  These are the only two that I am missing.

Any suggestions or response is greatly appreciated.

[ecfernandez]

Hi @cturlington, it seems the download you are mentioning is not showing up in your post. Could you please share that again?

Regards 

[cturlington · Accepted solution]

All,

The download was the SDK files from online.  However, I have since learned that particular download is not needed.  And in fact, the 2026 C3d software does not provide the above-mentioned reference files, as I suspected.  However, the key reference files are these:

accoremgdd.dll 

acmgd.dll

AeccDBMgd.dll

AecBaseMgd.dll

Civil.dll

acdbmgd.dll

found in C:\programs\Autodesk\AutoCAD 2026\, C:\programs\Autodesk\AutoCAD 2026\ACA, and C:\programs\Autodesk\AutoCAD 2026\C3D.