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i create scene ; and test the render many times ; today i change the hdri lighting and i use :dh207.hdr
i try render viewport and maxwell stopped and force closed ; now when i can't open the scene
i think the problem in the file ;any method to recover it ?

Not sure but maybe if that hdr is very big and studio tries to load it to show it in the viewport, it runs out of memory. So try opening studio, closing all viewports that are open, then loading your file.

the hdr is a small file and i use it many times with v2.7 and 3

Does it work if you import the MXS into an empty scene?

i tried that but the same thing
can i open it with PyMaxwell?