Invalid save zip file

[__Piet__]

Hello,

somehow my save got invalid, i cannot open it anymore, neither with factorio nor with any zip-tool or zip-repair-tool.

It propably happened when i started factorio. It didn't load completely, even after 2 minutes. I canceled the task (notice that factorio didn't even open my game).
After that my save zip file and all three autosaves were invalid zip files. Interestingly, saves of other worlds work fine.
I am not using any modification.
This is very frustrating to me as I realy liked my factory and don't want to start off again.

I know this is probably not a bug in fuctorio, but if anyone can help me fixing the file i would be deeply grateful!

(save zip file attached)

[__Piet__]

I opened the file with a hex editor and it contains zeros only. So unlike my map accidentially encoded to 8 million zeros, everything's gone.

however, i cant believe things like this happen.