Just in case this hasn’t been mentioned.
I decided change the legato playback option from default 105 to 100% on piece that was 99% finished, boom, Dorico crashes, windows crashes. File is corrupted and unable to open.
Went and opened one of the backups, have that to replace it. I was using 3rd party vst EWSLSo, in case that has anything to do with it, though I’m been using that for weeks without any prior issues like this.