Hello niklef
If you have already successfully managed to open the corrupted .ptg file as a single image file then I’m afraid I don’t think there is much more you can do
The only other thing might be to go through any backup files of the project you have and see what can be done with any of them in conjunction with the retrieved flattened image. And try and rebuild from there.
Sorry there’s not much else I can suggest I’m afraid
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