Opus crashed while opening the properties of a .gdoc file from Google Drive.
GDrive is set to stream files.
Crash log ID: 500 
Crash is in OpenHashTab.dll rather than Opus itself. (Added it to the thread title to help anyone else who might have the same problem.)
Presumably that's something which adds a tab to the Properties dialog. You may see the same crash in File Explorer if so.
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Yes. When called from FE, the properties dialog will show for a few seconds and then implode.
I guess it's ultimately GDrive's fault; nowadays, .gdoc files can't even be opened with an editor (might work if they are locally cached).
Thanks for the quick feedback!