Yep, it looks like he used Compass CAD. It’s software made and popular in Russia.
I downloaded free compass viewer.
And i found a reason. )
His drawing is in paper space. The model space is just empty. When i open the file in model space (which is, by the way, default mode if the viewer) - i see layers tree, but nothing renders. But when i open it in paper space - i see same layers tree and drawn picture of the part.
Such files don’t properly shown in most software. And it’s crazy not obvious reason to understand why you see empty screen)
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