How to mass-edit *proj files in VS
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In powershell, we first rename all csproj files to csprojxxx; so VS does not try to open them as projects instead treat them as text files:
ls -r *.csproj | rename-item -force -newname { [io.path]::ChangeExtension($_.name, "csprojxxx") }
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In File Explorer, navigate to project directory and search for *.csprojxxx, then drag all the items onto a new VS instace.