[Gimp-user] XCF doesn't open even when the preview is fine

["Oliver Dillenburger" <D-burger web de>]

Hello everybody,
 
I'm new with a problem that is bugging me.
I did spent hours on a pic with several layers, saving it regularly.
 
Today I tried to open it. The preview shows the picture just fine but gimp states I need to open at least one 
layer to work.
The XCF is 400 MB.
 Gimp 2.8.10 and 2.8.14 both had the same problem.
 
Any help is appreciated,
 
Oliver