How to open workbook in multiple Excel sessions?

Contributor

Simple enough question but the answer seems to keep changing all the time   So I start new instance of Excel365 by pressing down ALT but where-as I used to be able to open the same workbook I have in my principal Excel session "Read-only" in that second session, I now get "... open in another application.  Please close it and try again."  What does one have to do today to get a read-only second copy?

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