ARX Compatibility for AutoCAD 2025

Question

Hi Support, 
 
 I&rsquo;m currently using M-Color 9.9 successfully with Civil 3D 2024, but I recently installed Civil 3D 2025 and found that M-Color is not functioning in the new version. 
 
 After some investigation, I realized the ARX file currently being used (`MColor2021x64.arx`) was compiled for an earlier version of AutoCAD and is not compatible with the AutoCAD 2025 ObjectARX SDK. As you may know, AutoCAD 2025 introduced changes that require ARX modules to be recompiled specifically for this version. 
 
 Could you please let me know: 
 
 If an update or patch for M-Color 9.9 (or later) compatible with Civil 3D/AutoCAD 2025 is available or planned? 
 If there&rsquo;s a beta or developer build that I could test in the meantime?

I would appreciate any guidance you can provide. M-Color is an important part of our workflow, and support for 2025 would be greatly beneficial. 
 
 Thank you in advance for your help.

Craig Hawker · Answer

Hi Rob, 
 Unfortunately M-Files announced the EOL for M-Color about 14 months ago. The article states that a final version of M-Color for AutoCAD 2023 would be made available, but that there would be no additional releases after this. 
 I'd also highlight that there was a query more recently about open-sourcing the solution, but that unfortunately is not something that we are able to do. 
 I understand that this may not be the news that you wanted to hear. 
 Regards, 
 Craig.

ARX Compatibility for AutoCAD 2025

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