Revit: Missing Third Party Updater Message

December 29, 2025 Gregory Lee

When opening up a Revit model you all of the sudden get a pop up message stating that your file was modified by a third-party updater called AREXRevitStart : REXExtension: DReinfWall.

This message is popping up because someone working on the model has the Reinforcement extensions from subscription center installed and the user getting the message doesn't.

Solution:

  1. Update Revit
  2. Install 3rd party add-on
  3. Choose one of the four presented options
  • "Continue working with the file"
  • "Do not warn…" 
  • "Close without saving"
  • "Save the file under…"

About the Author

Gregory Lee

Sr Technical Support Specialist<br><br> Skilled in AutoCAD, Mixed-use, Renovation, Revit, and Sustainable Design. Strong arts and design professional with a BA in Urban design focused in Architecture from University of Washington.

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