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Since the installation of Maxwell V3 i can't get it to open mxs files with Studio. They always open with the render window.
And the thumbnails for mxs and mxi are missing.

I already reinstalled Maxwell and deinstalled and reinstalled only the shell extension.
Then i tried to fix it manually by deleting the registry entries for .mxs and .mxi...
Nothing changed.
I'm now on Beta 3.0.0.6 (which btw. fixed the issue of different versions of Node, Manager; Studio etc. )

for mxs file ; under file properties: choose open with .than choose studio

Yes, normally this should work...
This was the first thing i tried - and i have done it maybe a dozen times - but it always opens the render window instead of Studio