Here is a tip I learned from Tech Support the other day to recover a corrupt file. In fact, we have tried it on a Teamwork file that was giving us problems for more than a week (one team member crashed every time he would send & receive).
This method is called Forward Merging and simply merges a new & reset file into the "corrupt" file.
1. Create a New & Reset file in ArchiCAD
2. Delete all layers from this file and save it. We used the name crashmerge.pln
3. Open your "corrupt" file and select File->Merge and select the crashmerge.pln file to merge.
4. Save your file
Thanks to Eric Batte!
Archicad 7 - 24, HP ZBook 15 Mobile Workstation, Win 10