Hello Raze,
Thanks for your clear comment.Indeed the broken saves only had 36 files, where the working ones had 37.So I was able to identify the missing file: it was the inv.b0 file.
Unfortunately while using an older version of this file from one of the working saves into my yesterday saves did indeed make it possible to load the save again, it also meant that important parts of my equipment and inventory were missing.For example my teleporters stones were gone and all newly equipped armor with gold charms inside.
So I think I will just replay yesterdays part.But I think your explanation will still help others provided that the missing file is less essential.
