If you click to repair and restart Archicad and that doesn’t work close it down. Re-open Archicad without opening the file. Then select File, Open and navigate to your file. Select it but before click ok to open select the little checkbox to open and repair which should hopefully open the file. If it does make sure you go to publisher sets and uncheck the merge to one file option before saving again.
if this fails contact your local support and send it to them for repair.
Lee Hankins ArchiCAD 4.5 - Archicad 27UKI Apple Silicon 27.2.0 macOS Sonoma (14.4.1)
