D5 material setting lost

Working on big file, i loose d5 material i set when reopening from archicad ( 27 ), i loose d5 material as it revert to my archicad model material, i just spend 4 hours remaking all. Serious problem !!! image link just to show the size and details in the model

Hi there, sorry for this issue, have you perhaps moved the file from its original location or renamed it? You might also want to check your file’s version history and see if your progress can still be recovered. Let me know if this helps, thank you.
version history